Human Sacrifice Is Linked To Social Hierarchies In New Study

Saying they found "a darker link between religion and the evolution of modern hierarchical societies" than has been previously suggested, a group of scientists say ritual human sacrifice promoted stratified social systems – and helped to sustain inherited class systems once they were established....
http://www.npr.org/sections/thetwo-way/2016/04/04/473004808/human-sacrifice-is-linked-to-social-hierarchies-in-new-study?sc=tw