Then why has that version of "human nature" been absent from almost every indigenous tribe ever found? Practically every native people has been organized in a more-or-less non-hierarchical manner. You generally didn't seek power for yourself to dominate over others. For example, if you and some other hunters were dispatched to find food, and only you were successful, you wouldn't hoard up your meat and use it to make others do your bidding, like you would if you were really innately a power-seeker. You would share that food with the rest of the clan, confident that they would and will do the same for you, and deriving satisfaction out of helping your fellow man. Small nomadic communities, like the kind humans have lived in for the vast majority of their existence, cannot survive long in the wild in an atmosphere of excessive competition between factions. They need to rely on mutual aid and cooperation instead. As humans we are uniquely intelligent and social creatures. We work best when we pool our mental energy to come to collective solutions to our common problems.

P.S. That same human nature argument was used for centuries to justify slavery, you know.