I think it's important that we all try to give something to this medium, instead of just thinking about what is the most efficient way of telling a story or making an audience stay in a cinema.
Evil gives you far more strings to pull. But I must say that I have never been interested in the psychology of evil, not in the slightest. Perhaps I'm not interested in evil, but in the dark sides of human beings.
It is more difficult to manipulate with film than, for instance, video. The problem with video is that it gives you a thousand possibilities.