Se7en
Impeccable, breathtakingly good, chilling and very well acted. The film has one of the most interesting and gripping crime stories ever told, but the director's take on the different types of crime and criminals is eye-opening. The real reason why John Doe is a very good villain is because we are not shown any trauma in his life that shaped his character. He's a genuine psychopath who looked at the world around him and didn't see himself in it. He noticed the apathy that surrounds us and decided to go on a morbid crusade to convey a divine message.
The fact that no certain event in John Doe's childhood or early life affected his mentality and psychology gives him more credibility in the way that his character was a result of the entire world that we live in. Yes, the world we live in , because, even though the movie appeared in 1995, it describes perfectly our way of living or, better to say, not living well enough. My personal opinion is that parts of John Doe's mentality exist in any of us to different extents, but the question that David Fincher asks is whether the sins that we commit in our life are equally dangerous or have an equally great impact on us and others.