You jest, but that is a very possible outcome. When the U.S. Governemt defaults on it's debt and can no longer pay the ghetto heathens, they will erupt with a righteous anger made possible solely by a lifelong sense of entitlement, with a dash of white-hatred.
It has been written that psychologically, social welfare for the lower classes is merely a payoff to reward proper behavior. When that reward is removed, our cities will erupt in flames.
I went to a WalMart near my house for the first time yesterday. Although nearby, it is on the other side of the 610 freeway, and getting to it, and back home, is a bit of a hassle. After seeing the utter anarchy, rudeness, and self-serving behavior among the patrons, I say THANK GOD FOR THE FREEWAY, as it keeps that demographic away from my home. That said, I had previously drafted plans for barricading* my neighborhood in times of emergency, but now those plans take on increased importance.
Interesting idea, barricading a neighborhood.