“
I was struck by how big a factor the desire for revenge for 9/11 seemed to be. I was struck by the momentum, the emotional momentum, in the rush to war. It seemed once we’d been talking about war for a while, it almost became inevitable, despite lots of logical arguments against going to war. I wanted to understand why that was.
In the evolutionary psychology literature, you see that those are evolved predispositions. Those are behaviors that we see not just in our own times and in hunter-gatherer people, but, in fact, there are direct correlates we see in chimpanzees.”
Sex and War co-author Thomas Hayden, interview with Wired magazine