I don't think that it's only humans that are a problem, sadly. A program recently on TV showed how chimpanzees wiped out a rival clan on a murderous spree with obvious delight in bashing, tearing etc them to shreds. I didn't see the program myself, but was told all about it. The two main males fought, and yet after one was driven off the victor rounded up his team and they went searching for the rival clan and totally annihilated them, women and young included! I'm not sure if they also cannibilised them, but apparently chimpanzees do also practise cannibilism. My friend who saw the show was shocked at the obvious enjoyment they showed in this bloodbath!
Researchers also were surprised at the level of aggression above and beyond normal defence responses.
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