> It would seem inhuman not to recognize that some of the chimpanzees' behaviors are deeply unpleasant. And is aggression evil? Yes, I think so, at least when it involves physical violence that is inflicting pain. Violence is the opposite of virtue. I think that a major object of human endeavor and societal ambition should be to reduce violence.

I find this line rather interesting. I feel like there's a whole ball of wax that can be discussed here regarding human observation and the categorization of behaviors based on our understanding of virtue, right/wrong, and ethics.