Statism – a belief that a leader or government is legitimate or necessary for society. Amid the regularity of mass genocides and loss of information that plague our entire history, this seems to be the root cause of so much loss. Over, and over, and over again – for a flag.
We could just do what is right.
Class structure. Divide and conquer.
Correlates of War Project found some correlation between war propensity and patriotism.