If I had a child and deliberately chose carefully how it was raised I can create a whole new human capable of World Peace. The problem is is that child would be unique and incapable of interacting with the world which surrounds. I would teach the child that the world was grim and the hardships are mostly human caused. I would tell the child World Peace can never exist because there are just not enough peaceful beings in order to make it a reality. The people born have been indoctrinated by history and pre-programmed to war against one another. Being peaceful is counterintuitive and for them they could not exist on a peaceful world.