@ShaiHH You are still only talking about Western Europe from 1800s on. Humans and our ancestors have lived for literally millions of years. Do you really think everyone from the last 2 million years across the whole world was constantly at war with their neighbours? How could that possibly be more beneficial than cooperating? It even has been shown by researchers that most civilizations that "collapsed" didn't do so because of wars or hubris or massive sudden calamity, it was just that people decided they didn't particularly like living there any more and over time moved away to form smaller communities.
I'm not saying there was some idealized world where there was no interpersonal violence at all, but the whole idea of completely destroying another group of people and treating the loser like slaves is not universal. During, for example, Alexander of Macedonia's conquest of Western Asia there was very little actual violence outside of set battlefields. For local peoples, it was mostly just a change of who they paid their taxes to. So for some people there was a war, but for a lot of people it was just another day. And if someone really really didn't want to pay their taxes or hated their neighbours they would just pack up and move away. Like the Greenlanders did and how Thorfinn is now trying to do.
That is harder in today's society because of the development of the modern nation-state, but there are still refugees around the world who have decided they'd rather leave their home than take up violence. Are you going to say they are all cowards and ignorant and naive for wanting a peaceful life when they have literally stared in the face of death?
And if some group lived in peace for 100 years and at the end they were forced into a war and lost, were those 100 years of peace erased? Of course not. The Tokugawa shogunate lasted 250 years without war.