Piven's problem is that she's thinking that Americans, even disaffected ones, are like the poor in Europe, or anywhere else around the world. In America, even the most poor are financially head and shoulders above the poor anywhere else in the world. Even those who live in our 'ghettos' are in better shape. So, even though they may be angry about their plight, they don't want to bite the hand that, literally, feeds them.
And now, after a year or two of the Tea Party movement, middle and upper-middle class folks are beginning to understand what has been happening to them over the previous 40 years, as a result of ever encroaching government power, and they don't like it.