IMO, Occupy marginalized themselves by refusing to ever stand for anything. It's very easy to say what you're against. It's harder to say, in detail, what you would do differently.
Did you attend a rally? Did you sit in at a general assembly? Have you discussed the movements goals with one of its members? The media, quite falsely, reported (cherry-picking interviewees, a similar tactic used for all movements nowadays) the movement lacked any concrete goals - it is patently untrue. [1]
That's what the people marginalizing them said. To everyone else, it was pretty clear they wanted to see bankers in jail and regulatory restrictions that would prevent the problem from happening again in the same way.
