These people are used to having tax payer slaves support them. When the slaves are gone and they have to work on their own, there's going to be big trouble, especially in the liberal cities. They'll feel they have the "right to steal" those things they're used to getting for free. This is where the social unrest will come from.
Viz. Katrina. People who grew up with the idea that the government would take care of them are going to be more than a little disappointed when America is one big Katrina.