The reason millions of us binge cult documentaries or go down rabbit holes researching groups from Jonestown to QAnon is not that there’s some twisted voyeur inside us all that’s inexplicably attracted to darkness. We’ve all seen enough car crashes and read enough cult exposés; if all we wanted was a spooky fix, we’d be bored already. But we’re not bored, because we’re still hunting for a satisfying answer to the question of what causes seemingly “normal” people to join—and, more important, stay in—fanatical fringe groups with extreme ideologies. We’re scanning for threats, on some level wondering, Is everyone susceptible to cultish influence? Could it happen to you? Could it happen to me? And if so, how?