Tribalism (Nationalism) is the cause or justification for most wars, no? Us against Them. Whether it's Nations or Religions or Races. I think tribalism is so deeply rooted in most of our cultures, that ideas that challenge it are hard to process for most people. I think there's a lot of value in challenging assumptions. This specific proposal has a whole host of problems with it, but there is still merit in the idea of dealing with the cultural forces of nationalism.