Violent videos show apes may have sense of right and wrong

Chimpanzees may have a sense of right and wrong that echoes human concepts of morality, a study has found.
Two groups of the apes paid more attention to film clips of an infant chimp being killed by its own kind than clips showing other acts of violence. That they singled out this attack suggests the animals viewed it as being outside the boundaries of normal behaviour. Scientists believe the research may help to shed light on how human morality and social norms evolved. The study involved 17 chimps housed at two Swiss zoos in Gossau and Basel. They were observed as they watched film clips of chimpanzees unknown to them either engaged in neutral activities such as walking or cracking nuts, or displaying aggressive and violent behaviour.

http://www.theguardian.com/science/2015/jun/28/violent-videos-show-apes-may-have-sense-of-right-and-wrong

alternatively thay might just enjoy "snuff movies"