{updated 9.20.05}

[Excerpts from our class text, Goshgarian & Krueger's Dialogues: An Argument Rhetoric and Reader, 5th ed., pp. 49-60. I've included additional fallacies, and these are in sidebars with yellow backgrounds or in square brackets. -js]


Look for Logical Fallacies


When you read the arguments of others, you need to pay attention to the writer's strategies, assertions, and logic to decide if the argument is reasonable. Like the cross-examining attorney in a court case, you must examine the logical connections among the claim, the reasons, and the evidence to reveal the strengths and weaknesses of the writer's argument.


Sometimes writers make errors in logic. Such errors are called logical fallacies, a term derived from the Latin fallere, meaning "to deceive." Used unintentionally, these fallacies deceive writers into feeling that their arguments are more persuasive than they are. Even though an argument may be well developed and contain convincing evidence, a fallacy creates a flaw in the logic of an argument, thereby weakening its structure and persuasiveness.


Not all logical fallacies are unintentional. Sometimes a fallacy is deliberately employed -- for example, when the writer's goal has more to do with persuading than with arriving at the truth. Every day we are confronted with fallacies in media commercials and advertisements. Likewise, every election year the airwaves are full of candidates' bloated claims and pronouncements rife with logical fallacies of all kinds.


Recognizing logical fallacies when they occur in a reading is an important step

in assessing the effectiveness of the writer's argument. This final section of our chapter will acquaint you with some of the most common logical fallacies.




Ad Hominem Argument


From the Latin "to the man," the ad hominem argument is a personal attack on an opponent rather than on the opponent's views. Certainly the integrity of an opponent may be important to readers. Nonetheless, writers are usually more persuasive and credible when they focus on issues rather than character flaws. If, for instance, you are reading a paper against the use of animals in medical research and the writer refers to the opposition as "cold-hearted scientists only interested in fame and fortune," you might question whether the writer objects to the scientists' views or to their personal prosperity. Name-calling and character assassination should make you suspicious of the writer's real motives or balanced judgment. Personal criticisms, even if true, can be overemphasized and therefore undercut the writer's credibility.


However, there may be cases in which an ad hominem argument is a legitimate

rhetorical tool. When the special interests or associations of an individual or group

appear to have a direct impact on their position on an issue, it is fair to raise questions about their lack of objectivity on that basis. For example, the organizer of a petition to build a state-supported recycling center may seem reasonably suspect if it is revealed that he owns the land on which the proposed recycling center would be built. While the property owner may be motivated by sincere environmental concerns, the direct relationship between his position and his personal life makes this fair game for a challenge.


Ad Misericordiam Argument


Its name also derived from Latin, the ad misericordiam argument is the appeal "to pity." This appeal to our emotions need not be fallacious or faulty. A writer, having argued several solid points logically, may make an emotional appeal for extra support. Your local humane society, for instance, might ask you to donate money so it can expand its facilities for abandoned animals. To convince you, the society might point out how, over the last few years, the number of strays and unwanted pets has tripled. And because of budget constraints, the society has been forced to appeal to the public. It may claim that a donation of $25 would house and feed a stray animal for a month. Any amount you give, they explain, will ultimately aid the construction of a new pet "dormitory" wing. To bolster the appeal, the humane society literature might then describe how the adorable puppy and kitten in the enclosed photo will have to be put to death unless the overcrowding of the society's facilities is relieved by donations such as yours.


When an argument is based solely on the exploitation of the reader's pity, however, the issue gets lost. There's an old joke about a man who murdered his parents and appealed to the court for leniency because he was an orphan. It's funny because it ludicrously illustrates how pity has nothing to do with murder. Let's take a more realistic example. If you were a lawyer whose client was charged with bank embezzlement, you would not get very far basing your defense solely on the fact that the defendant was abused as a child. Yes, you may touch the hearts of the jurors, even move them to pity. Yet that would not exonerate your client. The abuse the defendant suffered as a child, as woeful as it is, has nothing to do with his or her crime as an adult. Any intelligent prosecutor would point out the attempt to manipulate the court with a sob story while distracting it from more important factors such as justice.


Ad Populum Argument


From the Latin "to the people," an ad populum argument is just that -- an argument aimed at appealing to the supposed prejudices and emotions of the masses. Writers attempt to manipulate readers by using emotional and provocative language to add appeal to their claims. The problem with the ad populum argument, however, is that such language sometimes functions as a smoke screen hiding the lack of ideas in the argument. You'll find examples of this fallacy on the editorial pages of your local newspaper -- for example, the letter from parents raising a furor because they don't want their child or the children of their friends and neighbors taught by teachers with foreign accents; or the columnist who makes the ad populum case against capital punishment by inflating the number of innocent people wrongfully executed by the state; or the writer who argues that if gays and lesbians are allowed to serve in the military, our national defense will be jeopardized by "sex maniacs."


Bandwagon Appeal


This familiar strategy makes the claim that everybody is doing this and thinking that. If we don't want to be left out, we had better get on the bandwagon and do and think the same things. The basic appeal in this argument is that of belonging to the group, behaving like the majority. It plays on our fears of being different, of being excluded. Of course, the appeal is fallacious inasmuch as we are asked to "get with it" without weighing the evidence of what is being promoted: "Smart shoppers shop at Sears"; "America reads Stephen King."



Begging the Question


Similar to circular reasoning, begging the question passes off as true an assumption that needs to be proven. For instance, to say that the defendant is innocent because he passed a polygraph test begs the question: Does passing a polygraph test mean somebody is innocent? Sometimes the begged question is itself loaded in a bigger question: "Are you ever going to act like you are equal and pay for one of our dates?" The begged question here is whether paying the costs of a date is a measure of sexual equality.



Circular Reasoning


Circular reasoning is another common fallacy into which many writers fall. In it, the conclusion of a deductive argument is hidden in the premise of that argument. Thus, the argument goes around in a circle. For instance: "Steroids are dangerous because they ruin your health." This translates: Steroids are dangerous because they are dangerous. Sometimes the circularity gets camouflaged in a tangle of words: "The high cost of living in today's America is a direct consequence of the exorbitant prices manufacturers and retailers are placing on their products and services." Cut away the excess, and this translates: The high cost of living is due to the high cost of living. Repetition of key terms or ideas is not evidence. Nor does it prove anything. Instead of simply restating your premise, find solid evidence to support it.



False Analogy


An analogy compares two things that are alike in one or more ways. In any form of writing analogies are very useful, as they expand meaning and demonstrate imagination. In arguments they can be wonderful tools for persuasion. Unfortunately, they can also lead the writer astray and make his or her argument vulnerable to attack.


The problem with false analogies arises when the two things compared do not match up feature for feature, and ideas being compared do not logically connect or are pressed beyond legitimacy. The result is a false analogy. For instance, a candidate for a high-powered job may ask to be employed because of his extraordinary heroics during the Persian Gulf War. He may even claim that being a CEO is like fighting a battle: He needs to be brave, tough in mind and body, and willing to take and deal out punishment. Although the argument might sound appealing, running a company involves more than combat skills. Certainly it is important for a corporate executive to be strong and tough-minded. However, an office full of five-star generals might not be expert at dealing with economic recession or product liability. The fallacy is that the analogy is imperfect. Business and soldiering overlap minimally.

A sound analogy will clarify a difficult or unfamiliar concept by comparing it

with something easily understood or familiar.



False Dilemma [Either/Or Fallacy]


A false dilemma involves the simplification of complex issues into an either/or choice. For example, "Either we legalize abortion or we send young women to back-alley butchers," "Love America or leave it," "Either we keep gun ownership legal or only criminals will have guns." Such sloganizing ultimatums, although full of dramatic impact, unfortunately appeal to people's ignorance and prejudices.



Faulty Use of Authority


The faulty use of authority occurs when someone who is an expert in one area is used as an authority for another unrelated area. For instance, the opinions of a four-star general about the use of force against an uncooperative foreign tyrant carry great weight in a discussion of U.S. foreign policy options. However, the opinions of that same individual about the Supreme Court's ruling on the question of assisted suicide are less compelling. His military expertise does not guarantee that his views on euthanasia are particularly valuable.


Advertisers frequently resort to the faulty use of authority to promote their products. Celebrities are asked to endorse products they may have no special knowledge about or any interest in aside from the sizable check they will receive for their services. Another example occurs when well-known popular figures rely on their achievements in one area to lend credibility to their views in another. For instance, the late Benjamin Spock, famous for his work on child development, became a spokesperson for the nuclear disarmament movement. Because of his reputation, people were willing to listen more closely to his views than to others who were less well known, yet his expertise in child-rearing gave him no more authority in this area than any other well-educated person. While Dr. Spock may, indeed, have been knowledgeable about nuclear arms, his expertise in that area would have to be demonstrated before he could be used as an effective authority on the subject.



Hasty Generalization


As the name indicates, the hasty generalization occurs when a writer arrives at a conclusion based on too little evidence. It's one of the most frequently found fallacies. If the local newspaper's restaurant critic is served underdone chicken at Buster's Diner during her first and only visit, she would be making a hasty generalization to conclude that Buster's serves terrible food. Although this may be true, one visit is not enough to draw that conclusion. If, however, after three visits she is still dissatisfied with the food, she is entitled to warn her readers about eating at Buster's.


Hasty generalizations can also occur when the writer relies on evidence that is

not factual or substantiated. A generalization can only be as sound as its supporting evidence. Writers should provide multiple and credible examples to support their points. Be wary of sweeping*, uncritical statements and words such as always, all, none, never, only, and most. Note whether the writer qualifies the claim with words that are limiting, such as many, some, often, and seldom.



*Overgeneralization or Sweeping Generalization


An overgeneralization occurs when a rule is applied to all cases without exception. Keep in mind that nearly all generalizations allow for exceptions. -js


Non Sequitur


From the Latin for "does not follow," a non sequitur draws a conclusion that does not follow logically from the premise. For instance, suppose you heard a classmate make the following claim: "Ms. Marshall is such a good teacher; it's hard to believe she wears such ugly clothes." The statement would be fallacious because the ability to teach has nothing to do with taste in clothing. Some of the worst teachers might be the best dressers. Although you might want to believe a good teacher would be a good dresser, there is no reason to think so. Writers must establish a clear connection between the premise and the conclusion. And unless one is made through well-reasoned explanations, readers will not accept the cause-and-effect relationship.


Political campaigns are notorious for non sequiturs: "Candidate Jones will be a great senator because she's been married for twenty years." Or, "Don't vote for Candidate Jones because she is rich and lives in an expensive neighborhood." Whether the voters decide to vote for Candidate Jones or not should not depend on the length of her marriage or the neighborhood in which she lives -- neither qualifies or disqualifies her from public office. The non sequiturs attempt to suggest a relationship between her ability to be a successful senator and unrelated facts about her life.



Post Hoc, Ergo Propter Hoc


The Latin post hoc, ergo propter hoc is translated as "after this, therefore because of this." A post hoc, ergo propter hoc argument is one that establishes a questionable cause-and-effect relationship between events. In other words, because event Y follows event X, event X causes event Y. For instance, you would be making a post hoc argument if you claimed, "Every time my brother Bill accompanies me to Jacob's Field, the Cleveland Indians lose." The reasoning here is fallacious because we all know that although the Indians lose whenever Bill joins you at Jacob's Field, his presence does not cause the team to lose. Experience tells us that there simply is no link between the two events. The only explanation is coincidence.


Our conversations are littered with these dubious claims: "Every time I plan a pool party, it rains"; "Whenever I drive to Chicago, I get a flat tire." "Every movie that Harry recommends turns out to be a dud." What they underscore is our pessimism or dismay, rather than any belief in the truth of such statements.


It's not surprising that post hoc reasoning is often found in arguments made by people prone to superstition -- people looking for big, simple explanations. You would be committing such a fallacy if, for instance, you claimed that you got a C on your math test because a black cat crossed your path that morning or because you broke a mirror the night before. Post hoc fallacies are also practiced by those bent on proving conspiracies. Following the assassination of President Kennedy in 1963 there was considerable effort by some to link the deaths of many people involved in the investigation to a government cover-up, even though the evidence was scanty. Today we hear Democrats protest that America goes to war every time Republicans are in office and Republicans protest that America gets poorer when Democrats are in office.


You might also have heard people argue that since the women's liberation movement, the number of latchkey children has risen sharply. The claim essentially says that the women's movement is directly responsible for the rise in working mothers over the last thirty years. While it is true that the women's movement has made it more acceptable for mothers to return to the workforce, the prime reason is particular to the individual. For some, it is simple economics; for others, personal fulfillment; for others still, a combination of the two. The feminist movement is one among many factors linked with women in the workforce and the consequent rise in latchkey children.



Red Herring


A red herring, as the name suggests, is evidence that is fallaciously used to distract the audience from the true issues of an argument. The term is derived from the practice of using the scent of a red herring to throw hunting dogs off the trail of their real prey. In modern life this fallacy is more often used to confuse the audience by providing irrelevant information or evidence. For instance, when the head coach of a major league team was accused of using team funds on personal expenses, he defended himself by pointing to the team's winning record under his leadership. While the team had undeniably performed well during this period, his response was irrelevant to the charges made against him. He had hoped to distract his accusers from the real issue, which involved his lack of honesty and abuse of power. A red herring may distract the audience momentarily, but once it is discovered, it indicates that the individual has little or no effective reasons or evidence to support his or her position.



Slippery Slope [Domino Effect]


The slippery slope presumes one event will inevitably lead to a chain of other events that end in a catastrophe -- as one slip on a mountain top will cause a climber to tumble down and bring with him or her all those in tow. This domino-effect reasoning is fallacious because it depends more on presumption than hard evidence: "Censorship of obscene material will spell the end to freedom of the press"; "A ban on ethnic slurs will mean no more freedom of speech"; "If assault rifles are outlawed, handguns will be next." America's involvement in Vietnam was the result of a slippery slope argument: "If Vietnam falls to the Communists, all of Southeast Asia, and eventually India and its neighbors, will fall under the sway of communism." Even though Vietnam did fall, the result has not been the widespread rise of communism in the region; on the contrary, communism has fallen on hard times.


Stacking the Deck [Card Stacking]


When writers give only the evidence that supports their premise, while disregarding or withholding contrary evidence, they are stacking the deck. (Science students may know this as "data beautification," the habit of recording only those results that match what an experiment is expected to predict.) A meat-packing manufacturer may advertise that its all-beef hot dogs "now contain 10 percent less fat." Although that may sound like good news, what we are not being told is that the hot dogs still contain 30 percent fat.


This stacking-the-deck fallacy is common not only in advertising but also in debates of controversial matters. The faculty of a college, for instance, may petition for the firing of its president for failing to grant needed raises while an expensive new football stadium is being built. The complaint would not be fair, however, if the faculty ignored mentioning that the stadium funds were specifically earmarked for athletic improvement by the billionaire benefactor. Also, if the complaint left unrecognized the many accomplishments of the president, such as the successful capital campaign, the plans for a new library, and the influx of notable scholars, it would be an example of stacking the deck.


As you progress through the chapters in this book, you will find that thinking like a critic is the key to understanding and responding to argument. It will make you a stronger reader and a more effective writer. In the next chapter we explore ways that you can think like a writer to find and develop topics for your own argument essays.


Plain Folk Fallacy


The plain folk fallacy occurs when a writer attempts to establish common ground with the reader, relying on associations that are irrelevant to the discussion. For example, in a speech before a largely "local" audience, he may mention that he was born and raised in Hawaii and attended public schools from kindergarten through high school to lend weight to his arguments against a single school board for the Department of Education. Another example: a candidate of X-ancestry campaigning in a neighborhood where the majority of residents are of Y-ancestry makes it a point to include many Y-ancestry supporters in his entourage. He may also sprinkle his speech with a few phrases from the Y language. The purpose in both these cases is to identify with the audience, assuming that they will be much more supportive of a person who is like them. -js



Strawman Fallacy


This fallacy occurs when a writer twists (misquotes, misrepresents, takes out of context) an opponent's arguments to make them vulnerable to his/her attack. By putting his spin on the other person's words, he creates a strawman or dummy. And, as you might suspect, a strawman is a lot easier to attack than the actual person. -js