That’s the thing with tribalism (or, as modern parlance would have it, cognitive bias): It’s hardwired into us, making it seem natural and valid. But people tend to forget that evolution isn’t intentional. It’s inefficient and random, which may mean that our instinct to team up is as necessary today as our appendix. And given that it pairs so easily with the artifice of advertisers or politicians, this instinct, like the appendix, can be just as dangerous when infected. Because what bias does most mercilessly is strip us of our reason.
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