Interesting interview with Nuremberg prosecutor Whitney Harris here. I like this quote particularly:

Harris: I am totally convinced that Adolf Hitler was only a name that symbolized the absolute and worldwide breakdown of morality in the 20th century. It started in 1914 with World War I when everyone killed everyone and no moral standards remained. Revenge was the order of the day and any excuse was permissible. And afterwards? What did the communists do in Russia? And the Japanese in China?