United we stand vs. marauders
We like tribalism for the same reason we like to eat fatty foods: We evolved that way.
Homo sapiens didn’t survive long on the African savannas as rugged individualists. But in groups, humans rose to the top of the food chain thousands of years ago and have been passing down their tribe-loving genes ever since.
Customs and practices that ensured the survival of the species were worked out through trial and error and passed from one generation to another. The knowledge accumulated until we hit the critical mass required for modernity.
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