for a couple of quotes from the book Good Omens, to cover the topic
"It may help to understand human affairs to be clear that most of the great triumphs and tragedies of history are caused, not by people being fundamentally good or fundamentally bad, but by people being fundamentally people."
"Just when you'd think they were more malignant than ever Hell could be, they could occasionally show more grace than Heaven ever dreamed of. Often the same individual was involved. It was this freewill thing, of course. It was a bugger"