think about it like this. a lot of people are really stupid. civilization is only, what? 6000-8000 years old. modern humans started some 300 thousand years ago, give or take. so a lot of people haven't really been able to use critical thinking to have the forethought of their actions and tend to act on their ancient primate impulses of violence because diplomacy and planning is just too much work. most of us are still stupid animals.
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