Seems to focus way too much on the bystander effect as a straw man example of "human evil". A much better picture of human evil would come from studying war rape, especially that of a victorious army. Any victorious army. Think Soviets in Berlin, Japanese in China, during WWII. The English civil wars were full of it as observed by Hobbes. Furthermore, it is ubiquitous throughout history. Any human convinced of their impunity, such as a conquering army, will absolutely be brutish and nasty to their enemies.