Unfortunately, it is not the point of government to do what is best for society. It is to organize what individuals want but cannot by themselves (emphasis on want). They are not there to “give us the best” but to give us the “minimum”.

I don't understand what you are trying to say.

The government is emergent behavior of evolutionary pressures.

For most of human history, war of aggression was a matter of a cost-benefit analysis which often have more benefit than cost. That has changed (relatively) recently because of how destructive it is that even the winner does not gain from it.

Point being, hierarchical authoritarian structures are very good at war (and other kinds of competition). That's why they exist. But they should no longer be needed.

They are entrenched and we need to evolve away from them.