That's not even remotely close to what people have done, and still do, to eachother. It happens all over the globe, during wartime a lot of **** happen and in peacetime people get, tortured, dismembered, murdered every day.
It's sick, only seriously disturbed people can watch films like that one, and not be affected. The only thing that upsets me more than that film is knowing that people do that sort of stuff to other people as well. For sure, some people deserve a bullet in the head, or two. Witnessing such an act would make me want to kill, mankind would be better off without such people.