Sometimes, by contrast, we see the counterevidence just fine—but, thanks to confirmation bias, we decide that it has no bearing on the validity of our beliefs. In logic, this tendency is known, rather charmingly, as the No True Scotsman fallacy. Let’s say you believe that no Scotsman puts sugar in his porridge. I protest that my uncle, Angus McGregor of Glasgow, puts sugar in his porridge every day. “Aye,” you reply, “but no true Scotsman puts sugar in his porridge.” So much for my counterevidence—and so much the better for your belief. This is an evergreen rhetorical trick, especially in
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