Proving the Thesis - Logical Fallacies and Appeals

Logical Fallacies (Flawed Logic) 

A logical fallacy is a fallacy in logic.  It is flawed logic.  In order to be convincing, using logic is important. Also, identifying the flaws in what someone is saying or writing is necessary for a critical analysis.

There are several logical fallacies:

1. Sweeping generalization – hasty generalization resulting in a conclusion that is not necessarily accurate;  inductive reasoning (going from a particular point to a universal rule) which is not thought through carefully.  There is one rotting apple in the bag; therefore, all the apples in the bag are rotting.
2. Argument to the person (ad hominem) – a statement raising questions about a person’s honesty or integrity who is taking a stand on an issue instead of making an argument on the issue itself.  The candidate opposing the widening of the road is being investigated for tax evasion instead of arguing that the widening of the road is needed to alleviate traffic on another road.
3. Non sequitur – a line of argument that really does follow logically.  The road should not be widened because the city park is nearby.  What does the park have to do with the widening of the road? This often happens when the argument is just not clearly expressed.  The road should not be widened because it will increase traffic on a street that many children cross to go to the city park.
4. Either/or fallacy – where only two choices are presented instead of giving all the options.  The county commissioners asked residents if they preferred a slight increase in taxes or charging a parking fee for on all county parks.
5. Begging the question – using the argument that something is true or accurate because it is true or accurate.
6. Bandwagon argument – Everyone else is doing it; therefore, you should
7. Appeals – use of language to sway the reader by appealing to emotions, logic, or ethics.
8. Strawman fallacy – where the opponent’s position is unfairly shown to be extreme or illogical in order to minimize its strength.
9. False comparison fallacy – where a position is compared to something which has some similarities but which is not comparable in a significant way resulting in a false negative comparison
10. Faulty causality fallacy – where an occurrence or event is represented to cause another occurrence or event because they happen at the same time or close in time
11. Slippery slope fallacy – where an action is represented to result in an adverse consequence even though that consequence is very remote.
12. Red herring fallacy – where an irrelevant issue or situation is raised to distract the argument from the point; changing the subject

Appeals

Appeals are the use of language designed to create a particular type of response in the audience.  There are three types of appeals.

1. emotional appeals – presenting information designed to result in emotion.  Commercials typically have emotional appeals to make the audience feel in a certain way.  Perfume commercials showing couples; diaper commercials showing happy babies.  There are many speeches that used emotional appeals to show the audience the validity of the point being made.
2. logical appeals – presenting information designed to result in the audience thinking that what is being promoted is logical.  Examples include a commercial to refinance focuses on how money can be saved or an evaluation of the beneficial effects of a specific course of action such as more community participation or a source of revenue for a business.
3. ethical appeals – presenting information designed to result in the audience thinking that what is being promoted is the right thing such as contributing to organizations that help victims of natural disasters.

Some uses of appeals are thought to be unfair such as images of abused pets or hungry children.  People tend to react emotionally instead of evaluating whether the particular organization will make good use of donations.