Fallacies are defects that weaken arguments. Other sources have defined fallacy as a false notion, a statement or an argument based on a false or invalid inference, incorrectness of reasoning or belief, or the quality of being deceptive.
The first known systematic study of fallacies was due to Aristotle in his De Sophisticis Elenchis (Sophistical Refutations). He listed thirteen types. After the Dark Ages, fallacies were again studied systematically in Medieval Europe. This is why so many fallacies have Latin names. The third major period of study of the fallacies began in the later twentieth century due to renewed interest from the disciplines of philosophy, logic, communication studies, rhetoric, psychology and artificial intelligence. (The Internet Encyclopedia of Philosophy).
Fallacious arguments are very common and can be quite persuasive to the casual reader or listener. By learning to spot them in your own and other’s writing, you can strengthen your ability to evaluate the arguments you make, read or hear.
It is hard to evaluate whether an argument is fallacious. So here are some of the most common fallacies, their definition and examples.
1. Accent Fallacy – is a fallacy of ambiguity due to the different ways a word is emphasized or accented.
Example : A Congressman is asked if he is in favor of the new missile defense system, and responds, “I’m in favor of a missile defense system that effectively defends our country”.
The shift on the emphasis of the words “effectively defends” from the word “favor” may give a different meaning to the remark.
2. Ad Hominem – means “against the man” or “against the person”. It is a general category of fallacies in which a claim is rejected on the basis of some irrelevant fact about the author or the person presenting the argument.
Example : A – “I believe that abortion is morally wrong.” B – “Of course you would say that, you’re a priest.”
3. Ad Populum – means “to the people” ; the arguer takes advantage of the desire most people have to be liked and to fit in with others and uses that desire to try to get the audience to accept his argument. One of the most common versions is the bandwagon fallacy, in which the arguer tries to convince the audience to do or believe in something because everyone else supposedly does.
Example : “Gay marriages are immoral. 70% of the Americans thinks so!” While the opinion of most Americans may be relevant in what laws they should have, it certainly doesn’t determine what’s moral or immoral. The popular opinion isn’t always the right one.
4. Anecdotal Evidence – is discounting evidence arrived at by systematic research or by testing in favor of a few firsthand stories.
Example : I’ve read the health warnings on cigarette labels and know all about that health research, but my brother smokes, and he says he’s never been sick a day in his life, so I know smoking can’t really hurt you.
5. Anthropomorphism – the error of projecting uniquely human qualities unto something that isn’t human, as in animals; but when done to nonliving things, the pathetic fallacy is created.
Example : My dog is wagging his tail and running around me. Therefore, he knows that I love him.
6. Appeal to Authority – backing up reasoning by saying that it is supported by what some authority says on the subject. This fallacy is committed whenever the authority appealled to isn’t really much of an expert, cannot be trusted to tell the truth or is not really an authority on the subject.
Example : We should not tolerate abortion. Many respected people, such as actress Miss Y, have publicly stated their opposition to it.
7. Appeal to Ignorance – this comes in two forms : (a) Not knowing that a certain statement is true is taken to be a proof that it is false; (b) Not knowing that a statement is false is taken to be a proof that it is true.
Example : Nobody has ever proved to me that there’s a God, so I know there is no God.
8. Appeal to Money – uses the error of supposing that, if something costs a great deal of money, then it must be better; or if someone has a great deal of money, then they’re a better person in some way unrelated to having a great deal of money.
Example : Mr. H is rich, so he should be the President of the Philippines.
9. Avoiding the Question – committed when the answer doesn’t really respond to the question asked.
Example : Question – Would Team A be in first place if they were to win tomorrow’s game? Answer – What makes you think they’ll ever win tomorrow’s game?
10. Begging the Question – a form of circular reasoning, in which a conclusion is derived from premises that presuppose the conclusion; asks the reader to simply accept the conclusion without providing real evidence.
Example : Women have rights, but women shouldn’t fight bulls because a bullfighter is and should be a man.
11. Black-or-White – is a false dilemma fallacy that unfairly limits you to only two choices. The key to diagnosing this fallacy is to determine whether the limited menu is fair or unfair.
Example : Will you contribute P500 to our environmental fund, or are you on the side of environmental destruction?
12. Complex Question – framing a question so that some controversial presupposition is made by the wording of the question.
Example : Question – Mr. President, are you going to continue your policy of wasting taxpayer’s money on missile defense?
13. Composition – mistakenly assuming that a characteristic of some or all the individuals in a group, is also the characteristic of the group itself, because the group “composed” of those members.
Example : Every human cell is very lightweight, so a human being composed of cells is also very lightweight.
14. Confirmation Bias – the tendency to look only for evidence in favor of one’s controversial hypothesis and not to look for disconfirming evidence, or to pay insufficient attention to it. This is the most common kind of Fallacy of Selective Attention.
Example : My wife loves me and there are so many ways that she has shown it. When we signed the divorce papers in her lawyer’s office, she wore my favorite color. She slapped me at the bar and called me a “handsome pig”, she used the word “handsome” when she didn’t have to.
15. Cum Hoc, Ergo Propter Hoc – means “with this, therefore because of this”; this is a false cause fallacy that doesn’t depend on time order, but on any other chance correlation of the supposed cause being in the presence of the supposed effect.
Example : The tribe lives near our low-yield cornfields. So, the tribe are causing the low yields.
16. Definist – occurs when someone unfairly defines a term so that a controversial position is made easier to defend.
Example : During a controversy about the truth or falsity of atheism, the fallacious reasoner says, ” Let’s define ‘atheist’ as someone who doesn’t yet realize that God exists.”
17. Denying the Antecedent – denying the antecedent of a conditional and then suppose that doing so is sufficient reason for denying the consequent.
Example: If she were Brazilian, then she would know that Brazil’s official language is Portuguese. She isn’t Brazilian; she’s from London. So, she surely doesn’t know this about Brazil’s language.
18. Division – the converse of the composition fallacy; merely supposing that because a group as a whole has a characteristic, it follows that the individuals in the group have that characteristic.
Example : R’s basketball team is the best in the league because it had an undefeated season. So R, who is their center, must be the best center in the league.
19. Equivocation – is sliding between two or more different meanings of a single word or phrase that is important to the argument.
Example : Giving money to charity is the right thing to do. So charities have the right to use our money.
20. Etymological – occurs whenever someone falsely assumes that the meaning of a word can be discovered from its etymology or origins.
Example : The word “vise” comes from the Latin word “that which winds”, so it means anything that winds. Since the hurricane winds around its own eye, it is a vise.
21. Every and All – turns on error due to the order or scope of the quantifiers “every” and “all” and “any”. This is a version of the scope fallacy.
Example : Every action of ours has some final end. So, there is some common end to all our actions.
22. Exaggeration – overstating or overemphasizing a point that is a crucial step in a piece of reasoning; this is a kind of error called Lack Of Proportion.
Example : The rescue workers, doctors and various assistants are all heroes because, with the help of God, they managed to save all the people involved in that accident.
23. Far-Fetched Hypothesis – the fallacy of offering a bizarre (far-fetched) hypothesis as the correct explanation without first ruling out more mundane explanations.
Example : Look at the mutilated cow in the field, and see that flattened grass. Aliens must have landed in a flying saucer and savaged the cow to learn more about the beings on our planet.
24. Hasty Generalization – making assumptions about a whole group from a range of cases based on a sample that is inadequate (usually because it is atypical or too small) .
Example : I’ve met two people in Iraq so far, and they were both nice to me. So, all people I will meet in Iraq will be nice to me.
25. Jumping to Conclusions – drawing conclusions without taking the trouble to acqurie all the relevant evidence, provided there was sufficient time to assess the extra evidence, and that the effort to get the evidence isn’t prohibitive.
Example : “This car is really cheap. I’ll buy it.” Before concluding that you should buy it, you should check its operating condition.
26. Lying – fallacy of reasoning that depends on intentionally saying something that is known to be false.
Example : Abraham Lincoln, Theodore Roosevelt, and John Kennedy were assassinated. They were U. S. presidents. Therefore, at least three U. S. presidents have been assassinated.
TRUTH : Roosevelt was never assassinated.
27. Pathetic – is a mistaken belief due to attributing peculiarly human qualities to inanimate objects (but not to animals).
Example : The storm is cruel. It always appears when I have an interview, it doesn’t want me to get to my interview on time.
28. Quibbling – complaining about a minor point and falsely believing that this complaint somehow undermines the main point.
Example : I’ve found typographical errors in your poem, so the poem is neither inspired nor perceptive.
SOURCES :
-The Internet Encyclopedia of Philosophy by Bradley Dowden.
-The Writing Center, University of North Carolina at Chapel Hill