Though it’s easy to pick on Donald Trump and his supporters, this cognitive bias is evident in humans in general and we see it in various situations. Below is one article and below that is an amusing video mocking Bernie Sanders supporters.
“Graves’s article examined the puzzle of why nearly one-third of U.S. parents believe that childhood vaccines cause autism, despite overwhelming medical evidence that there’s no such link. In such cases, he noted, “arguing the facts doesn’t help — in fact, it makes the situation worse.” The reason is that people tend to accept arguments that confirm their views and discount facts that challenge what they believe.”
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