Americans believe in evil, but we’re uncomfortable with tragedy. We accept that there are wicked people in the world, with malice in their hearts and a devil whispering in their ears. But the idea that many debacles flow from choices made by decent, well-intentioned human beings is more difficult for us to wrap our minds around.

The columnist's blog on politics and culture.

This is apparent in our politics, where we’re swift to impute the worst of motives to anyone slightly to our left or right. It’s apparent in our popular culture, thick with white hats and black hats, superheroes and supervillains. But it’s most egregious where the two spheres intersect: in our political fictions, which are nearly always Manichaean,...