And I suppose you can tell me of all those great civilizations which were not created by a great city. In fact, they are the places were the lower classes go to GET civilized.
Interesting hypothesis. Mine would be the opposite, that great cities are a result of an advancing culture. An agrarian/rural society cannot long last without a commerce center, and one would naturally spring up and undergo a typical urban cycle of boom, economic decay, moral decay, and finally - voting for democrats. The best way to deal with the blue-zoners is probably to kick out or lock up the lunatics. The empty hull of the city would provide excellent opportunity and eventually fill with red-zoners.