> Just because we're built for it doesn't mean other species will be.

You heard of what chimps get up to? Ants? Microbes? They don't just have wars; They have raiding parties, take slaves, serve as battlefield medics, compete in intrafactional and interfactional rivalries that slowly boil over… Hell, even trees actively release toxins to try to kill other nearby plants.

On a long enough timescale, war is almost certainly highly (and lethally) maladaptive.

But in a non-post-scarcity environment with social contact, creatures whose bodies disagree with entropy tend to learn that violence is an effective tactic for taking others' calories/oil and nutrients/minerals.

Maybe there's exceptions. I hope so, anyway.