I understand what is the purpose of these movies, but they should also contain a little morale.
Well, those are just films and I'm happy that in real world the evil will always get what he or she deserves.
When I hear the word "twisted",morality or teaching a lesson is the last thing that I think of.Sure there are some movies with a lot of bad shit happening with bad characters that come out with someone getting some sort of redemption,but I would never use the term "twisted" for those movies.For example,the movie The Way Of The Gun has it's two main characters to be the most despicable men around.The kidnap a pregnant woman just for the ransom money.By the end,when they realize that they are in not so good of a spot,they decide to give her back as a kind of noble deed.
Mystic River is another movie that has some bad shit happening to people,but in the end,one of the characters pays for another person's crime.Not really redeeming or uplifting,but just one of those stories that's tragic.
Now a movie like Perfume:The Story Of A Murderer,pretty fucking twisted.Hard Candy,pretty fucking twisted.I Saw The Devil,pretty fucking twisted.