Well if you watch the whole thing that’s not what it’s showing. It shows that if you can oust the overly violent rapist males then you can create a better, (by most people’s standards), more peaceful healthy culture with the decent males left. There was still a hierarchy, that’s how they taught the young males coming into the troop.
Also that everyone’s physical health will improve.
My title is a condensed version of the title of the video on YouTube. I think the point is that within the group the hierarchy has been largely dismantled. Outsiders coming in are retrained by everybody and anybody inside the group; not by a lower level operative who is coerced to do so by a higher status individual.
Humans are the problem, not hierarchy, hierarchy works fine in computer programs.