[setr]

I wouldn’t see it as that surprising; most of human history is... not fighting. Its doing exactly that: staying at arms length, because war is expensive (and even victory can leave you weak enough to a third party invasion).

If you want to see combat, increasing the number of actors beyond sustainability will naturally cause fights until the same equilibrium is reached.. add total resource depletion (not just regeneration) to break the equilibrium again

You don’t need anything as complex as boredom to break pacifist behavior; just variable resource constraints will easily do the trick