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Logical fallacies - Understanding when arguments do not make sense

2021.06.14

The ability to understand and evaluate the various claims we see on the news, in advertisements, and on social media is an important life skill. Similarly, being able to weigh up conflicting arguments and assess whether they are adequately supported by facts is part of academic work. Although we are all entitled to have an opinion, not all opinions are equal. Some are well reasoned and logical. Others may sound believable, but actually be built on shaky foundations.

 

Being able to see the logic of an argument is a very good way to help determine whether it is something you should take at face value or be a bit more careful about. Arguments that are based on faulty logic are called “logical fallacies”. They are surprisingly common, but being aware of them will make it a bit easier for you to see when arguments don’t quite make sense. Here are just a few of the most common ones:

 

Ad populum

This refers to an argument based on popularity. It may sound convincing at first, but just because many people believe something does not make it right. In the past, many people believed the Earth was flat, but we now know it is round. Similarly, the popularity of something does not prove its quality.

 

Ad hominem

This is the rejection of a point of view because of who said it. It often takes the form of an attack on someone’s skill or character. For example, saying “You can’t take John’s point about management seriously. He’s never run a business,” would be dismissing John’s opinion because of his (lack of) experience, not because his argument was weak. People often use this kind of argument when discussing politics—but even a politician you dislike may say something you agree with occasionally.

 

Straw man

The straw man fallacy involves misrepresenting someone’s point of view to make it easier to attack. Darwin’s theories on evolution were once attacked for saying humans evolved from apes. This idea was easy to make fun of, but it was not actually what he said. You may have seen this kind of tactic in the run-up to the American election when the candidates try to influence public opinion about their opponents.

 

False dilemma

This kind of fallacy presents a problem as having only two (usually opposing) solutions. The statement, “If you’re not for me, you’re against me” is an example of this. Another example would be “The Tokyo Olympics should either go ahead as planned or be cancelled completely.” While these are two possibilities, they are not the only two. (The Games could be postponed again, for example, or held with no audience.)

 

A little knowledge of these kinds of fallacies can make discussions more interesting and give you greater confidence in your own ability to assess the way others present their opinions. Making informed decisions about the information and views we see is even more important now that ideas spread so quickly online: we all need to develop the skills to separate fact from fiction.

 

 

 

Photo Credit: Pixabay@Pexels.com

 

 

 

Blog Quiz

1. A logical fallacy is …

a. an argument you disagree with

b. an argument which is logical

c. an argument that is based on faulty logic

d. an argument that is based on inaccurate facts

 

2. Which of these is an ad hominem argument?

a. I don’t think this is right: Donald Trump never says anything I can believe.

b. I agree with this. Most of the people I discussed this think so too.

c. I can’t decide until I’ve researched it more thoroughly.

 

3. What kind of logical fallacy is contained in the following statement? Gasoline causes too much pollution, so all cars in the future will be electric.

a. Ad hominem

b. Straw man

c. False dilemma

d. Ad populum

 

 

 

 

 

 

Scroll down ↓ for the answers to the quiz.

 

 

 

 

 

 

 

 

 

 

Quiz Answers

A1. C

A2. A

A3. C

 

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