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AMERICANS BELIEVE in a dizzying array of conspiracies. Some are relatively harmless. No one has recently attacked the Freemasons based on the bonkers belief that they sank the Titanic. But some conspiracy theories are destructive. Thousands of Americans have harmed themselves or others because they think that covid-19 jabs contain microchips or that the 2020 election was stolen. It’s getting harder to convince people that these ideas are wrong: to prosper in some political tribes, such as Donald Trump’s MAGA world, you must treat fantasies as articles of faith.