The reason history is like that, is because smart people are peaceful. They are wise. The violent emotional hateful greedy people are the idiots.
The idiots sometimes get a lot of power, and spread hate, and chase wealth and power with force.
This forces the smart people to become fighters as well. So they put all their brains into defeating the hateful assholes responsible for war.
And of course, they are good at it. Because they are smart.