Every man, however obscure, however far removed from the general recognition, is one of a group of men impressible for good, and impressible for evil, and it is in the nature of things that he cannot really improve himself without in some degree improving other men.
This is the crux of the moral pessimists: if they really wanted to promote their neighbor's redemption, then they would have to resolve themselves to spoiling existence for him, and thus to being his misfortune; out of pity, they would have to--become evil!
About the nature of human beings. I discovered that confronted by temptation, we will always fall. Given the right circumstances, every human being on this earth would be willing to commit evil.