While details of each conspiracy theory vary, they often attribute great power and influence to a small group engaging in nefarious activities. A classic example is the idea that NASA faked the moon landings. There are also numerous “false flag” conspiracy theories ranging from the idea that the Bush administration was behind 9/11 to the idea that school shootings are faked by anti-gun Democrats. There are also various medical conspiracy theories, such as those fueling the anti-vaccination movement.

There has been considerable research into why people believe in conspiracy theories. A plausible explanation is that anxiety and feeling a loss of control lead to accepting such theories. Ironically, people who embrace conspiracy theories seem less inclined to act against the conspiracy, perhaps because they feel helpless in the face of such imagined power. But there are some exceptions, such as when the conspiracy theory about Hillary Clinton running a slavery operation in a pizzeria led to a concerned citizen shooting up the place.

It is tempting to embrace a stereotype of the conspiracy theorist: someone immune to logic, oblivious to opposing evidence and perhaps suffering from mental illness. To broadly dismiss conspiracy theorists using this stereotype would be an error, though it does apply in some cases. Interestingly, some conspiracy theorists use  the same tools of logic and reasoning employed by critical thinkers and I will endeavor to illustrate this in a series of essays.

Since the world is a complicated place and is beyond the understanding of any one person, we often turn to experts. For example, most of us lack the time and resources to investigate immigration, so we must rely on experts. Accepting such claims based on the (alleged) expertise of the person making the claim is to use an argument from authority. This argument has the following form:

Premise 1: Person A is (claimed to be) an authority on subject S.

Premise 2: Person A makes claim C about subject S.

Conclusion: Therefore, C is true.

This reasoning is inductive (the premises provide a degree of support for the conclusion that is less than complete) and its strength depends on the quality of the authority making the claim. If the authority is qualified to make reliable claims in the subject area, then the argument would be a good one. For example, believing that this is what an argument from authority is because of my expertise as a philosophy professor who has taught critical thinking since 1989 would be good reasoning.  If the alleged authority is not qualified to make reliable claims in the subject area, then the argument would be a fallacious appeal to authority because the premises would not adequately support the conclusion. For example, if you believed what I said about quantum theory because of my alleged expertise, then you would fall victim to this fallacy because my expertise in philosophy does not confer expertise in quantum theory.

Most people who rationally believe any theory believe it based on an argument from authority, the exceptions are those who are the experts. For example, most of us believe in the theory of relativity because of Einstein, not because we have done scientific research.  In the case of conspiracy theories, believers often use an argument from authority: they believe the theory because an (alleged) expert told them it is true. For example, those who accept the anti-vaccination theory often refer to the debunked paper claiming a causal link between vaccines and autism or they believe because a celebrity tells them vaccines are dangerous. As such, for almost everyone the reasoned belief in a theory is the result of an argument from authority. So, then, what is the difference between the conspiracy theorist who believes that vaccines are dangerous because of what a celebrity says and a person who accepts relativity because of what Einstein said?

The difference, in general, is that conspiracy theorists fall for fallacious arguments from authority as opposed to accepting good arguments from authority. For example, believing that vaccines cause autism because of a debunked paper or because of what an actor says would be to fall for this fallacy. After all, unless the actor is also a medical expert on vaccines what they say about vaccines has no logical weight.

Resisting fallacious arguments from authority can be challenging, especially when the alleged authority is appealing, or the view being presented is what one wants to believe. However, there are standards by which to assess an argument from authority. To be a good argument, it must be such that:

1. The person has sufficient expertise in the subject matter in question.
2. The claim being made by the person is within her area(s) of expertise.
3. There is an adequate degree of agreement among the other experts in the subject in question.
4. The person in question is not significantly biased.
5. The area of expertise is a legitimate area or discipline.
6. The authority in question must be identified.

If all these conditions are met, then the conclusion is probably true. However, since the argument from authority is inductive it suffers from the classic problem of induction: even if all the premises are true, the conclusion could still turn out to be false. So, conspiracy theorists who believe “experts” are using the same argument as good reasoners, they are just using the fallacious version.