I did menrion WW2, didn't I? Hitler and the Holocaust were, IMHO, what caused proposals like the Morgenthau Plan. Luckily, the Marschall Plan won, and helped create a stable Europe. Before that, Europe was a hotbed of conflict.

Out of couriosity, Hitler and the Nazis would have justified ehat exactly after the war when it comes to the German population at large? That de-natzification wasn't near as complete as it should have been is a different story.