Had the protest begun almost anywhere else in New York City, it almost certainly would have been shut down far sooner.
While I'm sure we have readers across the political spectrum, the spatial component to this movement is undeniably a "teaching moment." Occupy symbolically laden space to strengthen your discursive case? This is a classic strategy (think Tiananmen Square and Tahrir Square for starters). The actual place occupied is privately owned, and ironically can therefore function as a public place of protest more effectively. What will you discuss?