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A fallacy is a flawed argument that appears valid but is actually invalid due to a logical error. There are many types of fallacies, including false cause, false dilemma, loaded question, begging the question, and presupposition. Fallacies can be used intentionally to deceive or arise unintentionally from ignorance. It is important to identify fallacious reasoning in order to have rational discussions and make well-informed decisions.

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Evaluate Your Argument on the Issue In this chapter you will learn how to identify and overcome errors in reasoning. This is a special step that applies only to issues because resolving issues involves finding the most reasonable belief. Two broad kinds of errors are examined—errors affecting the truth of your ideas and errors affecting the quality of your reasoning. A step-by-step approach to evaluate arguments is also included. Because your main objective in addressing an issue is not to find the most effective action but to determine the most reasonable belief, your main task in refining an issue is to evaluate your argument to be sure that it is free of error. Two broad kinds of error must be considered. The first affects the truth of the argument’s premises or assertions. The second affects the argument’s validity—that is, the legitimacy of the reasoning by which the conclusion was reached. A sound argument is both true and valid. Errors Affecting Truth Errors affecting truth are found by testing the accuracy of the premises and the conclusion as individual statements. The first and most common error in this category is simple factual inaccuracy. If we have investigated the issue properly and have taken care to verify our evidence whenever possible, such errors should not be present. We will therefore limit our consideration to the more subtle and common errors: · Either/or thinking · Avoiding the issue · Overgeneralizing · Oversimplifying · Double standard · Shifting the burden of proof · Irrational appeal Either/Or Thinking This error consists of believing that only two choices are possible in situations in which there are actually more than two choices. A common example of either/or thinking occurs in the creationism-versus-evolution debate. Both sides are often guilty of the error. “The biblical story of creation and scientific evolution cannot both be right,” they say. “It must be either one or the other.” They are mistaken. There is a third possibility: that there is a God who created everything but did so through evolution. Whether this position is the best one may, of course, be disputed. But it is an error to ignore its existence. Either/or thinking undoubtedly occurs because, in controversy, the spotlight is usually on the most obvious positions, those most clearly in conflict. Any other position, especially a subtle one, is ignored. Such thinking is best overcome by conscientiously searching out all possible views before choosing one. If you find either/or thinking in your position on an issue, ask yourself, “Why must it be one view or the other? Why not both or neither?” Avoiding the Issue The attorney was just beginning to try the case in court when her associate learned that their key witness had changed his mind about testifying. The associate handed the attorney this note: “Have no case. Abuse the other side.” That is the form avoiding the issue often takes: deliberately attacking the person with the opposing view i ...

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Week 4: Fallacies, Biases, and Rhetoric Just as it is important to find truth it is equally important to learn to avoid error. It is analogous to playing defense. The main way that we play defense in logic is by guarding against fallacies and biases. Fallacies are common forms of inference that are not good; they do not adequately support their conclusions. The best way to learn to avoid them is to learn to identify them so that you will see when they are occurring. Since there are literally hundreds of fallacies, we will only have time to discuss a small few. However, we will focus on some of the most common, and readers can go on to learn more, both from our book as well as other online resources. Here is a brief summary of a few of the most important and most common (these are explained in much greater detail in the book, and there are many more fallacies addressed in the book, so make sure to reach Chapter 7 before doing the activities of the week). This week's guidance will cover the following topics: 1. Begging the Question 2. The Straw Man Fallacy 3. The Ad Hominem Fallacy 4. The Appeal to Popular Opinion 5. The Appeal to Emotion 6. Other Fallacies 7. Cognitive Biases 8. Argumentative Devices 9. Things to Do This Week Begging the Question Possibly the most commonly committed fallacy is Begging the Question (by assuming a main point at issue). Here is a nice explanation: Circular reasoning is an extreme version of begging the question in which a premise is identical to the conclusion. Here are some examples of each: 1. Don’t listen to that candidate; he’s untrustworthy. 2. You shouldn’t bet on that horse; it’s going to lose. 3. Don’t buy a Mac since PCs are better. 4. Marijuana should not be legalized because that would be disastrous. 5. You should join my religion because it’s the true one. 6. That food is bad for you because it is unhealthy.How to Avoid Begging the Question In order to avoid this fallacy it is necessary to use premises that do not assume the point at issue, but rather that are based in principles and observations upon which both parties could in principle agree. Can you think of ways to fix each of the above arguments? What premises could you add to make the arguments, not only substantive, but also to support their conclusions in ways that are likely to be acceptable to someone who doesn’t already agree?An Example of Avoiding Begging the Question by Creating a Supporting Argument Suppose you want to say why abortion is wrong, and you use the premise that abortion kills a human being. This argument simply assumes that a human fetus is a human being, which is a major point at issue. One way that you might seek to get out of this problem is to come up with a supporting argument for that premise. That is, you might construct a piece of reasoning intending to demonstrate to the other parties why a fetus should count as a human being. To do this without begging the question will be difficult, but it typically will involve.

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Faulty Arguments, Logical Fallacies and Poor Reasoning Faulty ArgumentsThis PowerPoint contains some of the common errors people make in reasoning. If you listen, you will hear many of these fallacies in everyday conversation.The “natural” cure and herbal medicine literature is rife with glaring examples of poor argumentation.Study these generic examples and you will be able to spot them in the assigned articles with ease. Poor Logic Emotional AppealThis is an attempt to sway the listener by getting him emotionally involved. Emotions shut down reason!Sick or scared people are especially vulnerable. Ad Hominem/ Personal AttackArguments of this kind focus on the character of the person advancing it; they seek to discredit positions by discrediting those who hold them. They attack the arguers rather than the arguments.Politicians are often subjected to ad hominem attacks Bandwagon/ Ad PopulumThe difference between the two is that the bandwagon fallacy places an emphasis on current fads and trends, whereas the ad populum suggests that an idea must be true simply because it is widely held. Appeal to AuthorityFor example, an appeal to authority argument seeks to persuade by citing what someone else, a perceived authority, thinks on the subject, as if that resolves the question. The degree of support that such an appeal lends to a claim varies depending on the particular authority in question, the relevance of their expertise to the claim, and other factors, but in all cases is limited. Appeal to AuthorityAn appeal to authority argument seeks to persuade by citing what someone else, a perceived authority, thinks on the subject, as if that resolves the question. Celebrity endorsements sell products.Even worse, celebrity endorsements of political figures win votes. Yikes! Faulty StatisticsMisunderstanding or misusing statistics to shore up a weak argument.Example: “We must fund our schools better! Half our children are below average on their math tests!”People pull bogus statistics out of thin air to sound impressive. Research by ExegesisResearch by exegesis is using a book as an infallible reference source.Usually it refers to the supposedly infallible Bible, but not always.People cite Bible verses to convince people that being gay is wrong. Either/Or & Slippery SlopeSlippery slope arguments falsely assume that one thing must lead to another. They begin by suggesting that if we do one thing then that will lead to another, and before we know it we’ll be doing something that we don’t want to do.They conclude that we therefore shouldn’t do the first thing. The problem with these arguments is that it is possible to do the first thing that they mention without going on to do the other things; restraint is possible. Slippery Slope Example“If you go out with that kind of guy, you will get pregnant and end up dropping out of college.”Either you stay in school or you won’t get a good job. Red HerringThe red herring ...

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