How is 97% of human history fleeting? And no-one said it was a Utopia. Enforced egalitarianism is a survival mechanism and a social organization tool used even today for foragers around the globe. They have children and families too, and yet, still keep in mind the needs and benefit of the entire group. Granted, they have smaller societies than we do in the West, but the question is not whether or not most of us can revert to living exactly like humans did pre-agriculture (obviously, we can't). The question is whether or not certain people can wrap their brains around the facts, which indicate that this is indeed our history.