Once upon a time, tales centering around moral dilemmas were difficult. The good guys made hard choices. When the hero had a dark past, there was always the question of whether he would beat it or it would beat him. This was the stuff of countless westerns.
Today there seem to be two trend in movie morality. First is the meme which says "the world is screwed up and learn to live with what you can get away with." Kim du Toit opines upon this trend. The second is the moral train wreck, the movie which depicts a person making all the wrong choices and turning his life into a hell of his own making. An example of this is the Bill Paxton movie A Simple Plan or perhaps (I haven't seen this one) Ben Affleck's Changing Lanes.