Are We Chained to Hierarchies?

In 2012 researchers writing for the Journal of Human Nature published the results of a study into a sample of 53 human societies in which polyandrous unions were common. Scientists think this is plausible because many of our modern ape and monkey relatives show evidence of this too. It would seem to push the conclusion that we are to some extent, at least irrevocably chained to hierarchy to systems of inequality. In other words, to a world dominated by bastards.