For very smart people, Doctors seem unusually prone to dumb and/or shady ideas. My pet theory is that, if they’re going to succeed in a hypercompetitive, rigorous, and important field, they’re forced to specialize so early (in a general “pick a career” sense, not the later medical specialties sense) that they end up both not well-rounded and lavishly praised for their intelligence and confidence. That sounds like a recipe for confirmation bias to me.