This was a big year for conspiracy theories. They’ve staked out more space in the headlines than we used to be comfortable with and stayed long enough that we’re starting to get used to it. The energy feeding them comes from above, as Trump and other mainstream media figures find new ways to harness conspiracy theory culture, and from below, as movements like Q Anon find ways to raise their profile with cynical self-awareness.
October was particularly gruesome. While relatively benign groups were busy ginning up new conspiracy theories for the benefit of the US and Russian governments—a bizarre flipflop of their traditional hostility to mainstream power—two men made headlines in a horribly familiar way. One murdered eleven people at a synagogue in Pittsburgh, and the other mailed more than a dozen bombs to Trump’s critics. They apparently both believed that Jews and liberals were plotting against them, and they decided to fight their imaginary enemies by slaughtering strangers.

These are two different expressions of the same basic phenomenon. Not every conspiracy theorist will act on their beliefs, and even fewer will become violent. But those extremists aren’t arising in a vacuum. They radicalize over time, after years of absorbing frantic, paranoid calls to action the culture that grows up around particularly invidious conspiracy theories. We can’t do much to control the bell end of violent extremists directly; only law enforcement is really equipped to do that, and unfortunately only after the damage has already been done. But going into the holidays and 2019, we—and that does include you, the reader—can do something to disarm the culture that radicalizes them.