Well said. I've written a lot about politics and the psychology/philosophy behind political organization. Specifically rational vs irrational self-interest. This tribalism, as you call it, is indeed the problem. It's the same groupthink that propels modern politics, particularly what motivates special interest groups that found that this tribalism works. When you can prove that your tribe is somehow aggrieved and act in concert with other aggrieved tribes, you have modern America. The therapeutic community came up with blame transferral back in the '70's and it now pervades modern society (and politics).