So here's my point-by-point analysis of Zuckerman's Fireworks. I'll put Phil's comments in orange, in honor of the holiday.
It's so weird when David picks and chooses his examples. He didn't tell you about the Australian aboriginals, perhaps the most peaceful society ever known (among) humans. An indigenous, non-Christian people, who were horrified by the acts of the missionaries. So yeah, pick the Yanomamo, the most notorious violent people you can find in all of anthropology, but ignore the aboriginals. Again, he's always taking the worst example, rather than admitting there could be hope elsewhere, and I don't know why. I detect it's defensiveness.