I've heard it equated to the women's rights movements of the 60s(?) where they wanted equal rights with men, but had no way of achieving it. They had no solution to offer. All they were able to do was voice their dissatisfaction with the way things were.
Still... regarding Occupy, I can't help but wonder how many of them are hoping they get beat up by the law so they can turn around and sue them... getting rich in the process.