 Sometimes we think of those as synonyms, but they really weren't. And so these ideas are already on the table from World War I, and then they only become more powerful and more influential as you go through World War II. And with the Holocaust, there's just even more questioning of the idea that history is ever going to be a story of progress, especially, I mean, this is a scale of destruction that just cannot be justified as sort of necessary evil in any way.