The predicament confronting liberal democracy, however, isn’t a resurrected Hitlerism or a manipulative Putinism. It isn’t even Trumpism, except as a sort of thermometer reading. The trouble is in us: in our readiness to generalize from the web levels of hostility and aggression inconsistent with the legitimacy of any political system. By embracing Trump in significant numbers, I mean to say, the public has signaled that it is willing to impose the untrammeled relations of social media on the fragile forms of American democracy.