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Wing-nuts mostly have authoritarian personality disorder. Right-wing talk appeals to it. So does fundamentalist Christianity. Most people in radio today, also have it. Such people don't respond to logic or evidence but to authority. So, saying "I'm an expert" is mostly effective with such people. A few recycle authoritative opinion and then claim to be experts, too - like talk show hosts.
Left wing extremist are just as susceptible to blindly accepting anything their favorite demagogue says. That's why I do not respect demagogues from either side of the political spectrum. I do take the sum total of all a person's public statements into account, not just the content of a particular sound bite. I have heard sound bites of many people I respect that imply "I'm an expert" as their proof, but when I am familiar with their entire body of rhetoric, and have read them publish detailed proofs based on logic and citations of specifics, I take all of that into account. Rush Limbaugh has never done that. A former local talk show host in Pittsburgh, Jim Quinn, did often provide detailed proofs based on passages from the Constitution and Federalist Papers to support his claims, though not on every single show.
Also, in the case of religion, we see a major exception to the idea of accepting something as "gospel" just because of who he is. When God says something, that is THE authoritative source. Religious beliefs, unlike political beliefs, are genuinely matters of faith, not objective proof.