Well, I'd say that most of these protesters are graduates who are in $100k debt or something from tuition loans, and find it unfair that they can never pay it back in the current economic environment and job market while Wallstreet banks get bailed out all the time even if they can't compete.
It's about suck-ups making policy for the 1%, leaving the average American out of the equation. That's why I think the US has become a feudal state.
But don't worry, in 2012 a new president will be elected, and then everything will be better. Change is coming, this time it's guaranteed!