This guy seems to think that the reason people get into wars is because they don't like each other's faces, or something. That's not a reason to risk your life

This guy seems to think that the reason people get into wars is because they don't like each other's faces, or something. That's not a reason to risk your life in a violent conflict. The reason wars start is because the king/emperor/CEO or whoever is at the top of the food chain has an interest in expanding their dominion because it makes them richer. That's why wars get started. To think that wars just randomly start because people are crabby or don't have an adult to supervise them- that's the thinking of a child. But he says right in the article that there's no meaningful way to actually control people in another system! So what would be the reason to go to war?