[handedness]

> No invention was able to steer the psychopaths away from waging wars.

Nukes and MAD did a pretty good job of that.

Your model, that psychopathy is the necessary precondition to war, is a popular one, but it's not grounded in reality or history very well at all. It's a harmful view when broadly held, on balance.

Nations have interests, and nations sometimes go to war to pursue the geopolitical imperatives they rationally believe serve their interests. Computer-controlled drones notwithstanding, there's nothing new under the sun. The unprecedented (and likely transitory) period of peace and prosperity during the Cold War was the anomaly, and we're now reverting back to the mean.