I like them because they force us to examine things that we would rather ignore and cause us to re-asses our commitment to our attitudes and values.
I think in some ways that's why I don't like them. I have a tendancy to want to believe that everyone has some good in them and I try to appreciate everyone's values and thoughts based on my idea that we're all doing the best we can. But seeing something like this type of movie reminds me that there are people who, in my opinion, don't deserve life. It brings out my ugly side that wants to rid these types of people from the world. I tend to try and stay away from negativity as much as possible so I guess that's why I stay away from these types of movies.
Back on topic: I watched IP man on netflix- a typical kung-fu type movie. I enjoyed it enough that I'll watch parts 2 and 3 eventually.