Our own Dr. Bliss and our net friend AVI are our go-to people on tribalism.
For better or worse, tribalism is in our blood. It probably was essential for human survival, and probably still is for non-human primate survival. Probably for us, too, if we value our own culture at all. I do value mine - my culture and my subculture.
AVI takes a look at Tribal Elders, Young Turks, and politics.