Study: The Evolutionary Dominance of Ethnocentric Cooperation

http://jasss.soc.surrey.ac.uk/16/3/7.html

In models, tribalism or rather ethnocentrism is the most effective survival strategy for various groups of people. Egalitarianism is quickly subverted by those practicing ethnocentric survival strategies and we've already seen this happen in real life with Jews in Western nations. There's a reason they push egalitarianism on everyone else while remaining the most ethnocentric group on the planet, it allows them complete dominance and parasitism.