As violence is a crude expression of complex emotion, as emotional expression has evolved we can now do way more psychological damage with a quip than a fist to the jaw could ever do. Out of all the millions of sentences you’ve been exposed to, there’s one you think of when I say “the one that hurts.”
So to has War been refined so as to be nigh invisible and certainly within the realm of plausibly deniable. Might be that Human Minds are the only Earth resource still up for grabs.

Do you have an Adult understanding of what the Children are being taught?