Coexistence long ago?

Humans lived mostly in nomadic, hunter-gatherer groups of up to 150 members. Back then, the world was sparsely populated (according to some estimates, the global population was no more than half a million around 15,000 years ago), food was abundant (at least, for the most part), and humans were quite healthy.

Therefore, it seems unlikely that they would fight against each other for resources, or for any other reason really. This doesn’t mean that they never did fight, it does suggest that they peacefully coexisted, without the need for competition and organized violence.