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I'd say it's our monkey genes at work. When Chimps meet a male that is not their brother, they get theirs and kill him. Killing another community completely has

• bmelton 4y ago
  I think that's definitely a part of it. Our monkey brains process that there is danger, and (naively) find ways to amliorate it in peer groups. We associate in-groups with safety and out-groups with dangers, and both infinitely large and infinitesimally small in (or out) groups would require the brain to do the much bigger work of individual threat analysis. Delegated decision-making.