Evolve out. We created war so the most aggressive, patriotic, authoritarian genes would be removed from the pool before they could spread.
It was working. But then we extended war to murdering pacific civilian populations, which RUINS THE WHOLE IDEA.
We need to bring back mass standing armies of the rural poor that grind each other into dust. Balance the forces so the war just continues forever with neither side achieving any gains. A dozen generations of that and we could start seeing a change in the species for the better.
Europe from Marlborough thru Zhukov?