We may not be able to escape it but we can mitigate it. The number of wars and especially the number of casualties has shrunk ever since WWII and the overall trend is even older.
Why should we start post ww2?
If we start in 1900 the trend is probably downwards.
Cherry picking start dates isn’t scientific.
The long term trend is very debatable, Pinker’s
Better angels is abysmal in its war stats.
Not to mention we narrowly avoided nuclear war on at least 2 occasions due to the actions of individuals. Pure chance saved us from being by far the worst killers in history.
The same goes for violent crime, at least in affluent and civilised countries. Social security, the rule of law, education and not least a humanist philosophy based in the Enlightenment have transformed our culture in just 400 years. We are still far from being peaceful but we are on our way.
The enlightenment was responsible for the violence of the French Revolution and the Soviets so it’s not all good.
I agree that societal conditions can mitigate our nature, and the ability to provide security and well being makes violence less likely, but I don’t think these are anything more than transitory provisions and sooner or later us humans will mess it up.
We cannot be saved from ourselves.