Her answer was based on her needs, not the chimps needs. That's why she is selfish in my book. I have two cats because I love them and I take care of them as such. I don't try to humanize them in any way at all. They both do their own thing. To say "They make me happy" is a very selfish thing to say. The chimp looked calm, but as she said, once they hit puberty, their hormones change and obviously especially in males, they're going to be violent to some kind of degree, this is how all animals are, including humans. However, a chimp is a pretty smart animal, so underestimating that they would do something when they are also not capable of learning to such a degree to override hormones, is a little like thinking men don't think about sex all the time.
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--- ?Be who you are and say what you feel because those who mind don't matter and those who matter don't mind. ~ Dr. Seuss ---