People tend to have a disconnected view of history. We think of things that happened before our lifetimes as ancient events performed in very different times by very different people, depicted in black and white images from our textbooks. Those crazy primates voted for Hitler. And they participated in the Salem witch trials. And they bought slaves. And they committed genocides.
But thankfully they're not the same people as us. We learned from their mistakes, right? We're enlightened. We have smartphones and shiny teeth and refined morals. We'd never do that kind of thing. Would we?