[Rury]

You don't need real evidence. Just the most simplest thought experiment in the state of nature (which is anarchy). How do two wild animals win a dispute over something? They either fight violently, or intimidate (ie persuade) their opposition into getting their way. The act of avoiding violence (giving into intimidation), is an act to ceding to the other as the dictator.

> perhaps humans have been conditioned to operate within a power hierarchy

Yes, exactly! No human, nor animal, wants to be perpetually in violence, as it is very risky to living. So, if they wish to avoid violence whenever a dispute arises, they naturally subject themselves and cede to the other as the superior authority in the matter, letting them get their way. However, if a human/animal ever thinks the reward for winning a fight outweighs the risks of violence, they will indeed risk the fight. Repeated disputes where one continues to be the victor, conditions those in the matter who is superior and inferior, and a power hierarchy is naturally established.

The only way communism can ever work, is if there is never any disputes. That is not a practical scenario outside a power hierarchy, and hence why it does not work in practice. And for those that don't see how "communism == anarchy", just look at how "public == many", and "private == few".