The film was intended to show what people have believed in and pointed to as evil throughout history. It was meant to get you to think about what evil really is. It is meant to show that when we get too obsessed with "evil" we might end up taking part in it ourselves.
One has to separate evil and human cruelty. Human cruelty is people not being nice to one another. Evil is soemthing else, it is something we have created, a word and a concept for things that are not acceptable. It is a label for things that we do not understand and dont want to understand.
