Catholic blogger Simcha Fischer has written an excellent post titled, But what if we’re not scientists?, which addresses the question: how can laypeople decide whether or not to accept a scientist’s say-so on a given topic? She warns against some of the common cognitive pitfalls that we are all liable to make, on occasions (I’ve listed her key points only):
So, how do we go about deciding which experts to trust, and which to be suspicious of? Here are a few of the traps we can fall into:
Mistrusting a knowledgeable person because he expresses his ideas in an unpleasant way.…
Mistrusting a knowledgeable person simply because he said something that makes you mad or upset or scared.
Trusting a knowledgeable person simply because he said something that makes you feel happy or peaceful or contented.
Trusting a knowledgeable person simply because he has a degree or went to a certain school.…
Mistrusting a knowledgeable person because you disagree with him about unrelated things.…
Trusting a knowledgeable person simply because he agrees with you about other things.…
Trusting a knowledgeable person because it would be uncharitable to question his findings, or because his personal life is difficult at the moment.…
Trusting a knowledgeable person because he has published a study in a scientific journal.…
Trusting a knowledgeable person who says things that you don’t understand at all.
Regarding the last point, Ms. Fischer observes:
Remember, the reason you decided to trust this person is because you believe he understands things better than you. But he should still be able to convey at least some of what he understands to people who are not experts, or he should at least be able to point you toward more accessible explanations. Someone whose writing is entirely opaque to you is someone you have no reason to trust.
I addressed the issue of when it is rational not to believe an expert in my 2010 post, Expert, smexpert.
Can readers think of any more cognitive flaws, in addition to the ones identified by Ms. Fischer?