Elaborate ritual killings such as being crushed under a newly built canoe and decapitation after being rolled off a house laid the foundations of class-based structures in modern societies, a new study of Austronesian cultures suggests. — http://www.abc.net.au/news/2016-04-05/human-sacrifice-may-have-helped-build-social-class-structures/7297460
The source article is Ritual Human Sacrifice Promoted and Sustained the Evolution of Stratified Societies in Nature magazine. I see from its first paragraph that it uses our old favourite, Bayesian analysis.

Egalitarian societies are a good thing.
Don’t we see even in class societies that no longer practice human sacrifice the upper classes expending the blood of the lower classes in other ways — all buttressed by noble and praiseworthy ideologies, of course.
Neil Godfrey
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Neil, can you spell out in more detail what you mean by a desirable “egalitarian” society – politically, economically and socio-culturally?
Read the context — and the linked article the post is directing readers to. I don’t like the idea of human sacrifice. One is less likely to find it in the record of egalitarian societies.
All tribal societies have had a practice of killing strangers much like chimpanzees. We have bigger brains but killing others its what we’ve done since the beginning. We are improving a bit though. Keeping out immigrants is better that killing them and many of us have moved past that.