I think that it is useful to remember that this "Occupy Wall Street" thing is, at its root, the product of a community organizer project. That means that the primary goal of the entire thing is agitation and chaos and at that it is succeeding admirably with both the willing and unwitting assistance of the leaders of government at all levels and, as usual, the compliant media.
Remember to consult Alinsky to understand what it is that you are seeing. Perhaps there is a historical example of a society getting together in an orderly and peaceful manner and choosing a Marxist form of government but right off the top of my head there are none that come to mind. Instead, history is rife with example after example of agitators stirring up communities to demand revolution. The people that you see demonstrating, protesting, etc. and demanding revolution are "useful idiots." Joining such a demonstration, regardless of what you believe, regardless of what you are demonstrating for is aiding the organizers and furthering their goals which makes you, by definition, a "useful idiot," too.
The difference between these assholes and the Tea Party could not be more stark. The "Occupy Wall Street" people are demanding revolution. They want to tear down the existing system and start over. The problem with that, of course, is that no one knows what would happen after the system is destroyed but chances are that it would be something resembling socialism or communism. The Tea Party is extremely Constitutional in nature. They want to work within the system to return the country to something more closely resembling the Founder's vision. They want to work in an orderly and organized manner.
Anyone who is inclined to follow the Tea Party and all that they stand for should stay as far away from this mob as possible. To align yourself with them is to give tacit approval to their goals and that makes you, regardless of your intentions, a "useful idiot."