It seems like a lot of these movies some of you just don't want to see due to violence or other dark or deprived behavior. If that is the case, I won't argue. But if you think that it's possible for depravity in a movie to lead to transcendence, there is some great stuff here.
Twelve Monkeys is just amazing. I really don't remember that much violence in it. Maybe in the WWII scene?? But the MPAA rated it R for violence and laguage, so I guess there's something there. I don't think it would turn you off though. If you are interested at all in time travel movies, this is one of the best!!!
A Clockwork Orange is also amazing!! But if you are that worried about disturbing or violent imagery, then I can't really recommend this. The film was originally rated X when it first came out and that rating existed. The whole premise of the film is about trying to reform a man who is obsessed with commiting what he calls "ultraviolence". That includes all kinds of violence, murder, rape, and other devient sex acts all without remorse. The methods used to attempt to reform him however lead to many very interesting and relevent questions about society and the human condition. I even consider it a very Christian film in respects to what it says about free will. But again, you will see weirdos with creepy masks muder a woman with a gigantic penis statue. It even makes Beethoven music seem completely alien and menacing!
I'm kind of shocked that people are recommending Kill Bill to someone who is adverse to too much violence in movies! While some of the violence here is quite stylized, it is most definitely extreme violence and depravity. And I find any "lessons" in the film to be rather banal. It's quite a ride and a movie I like to watch, but it's my least favorite Tarantino film.