Yeah, I think expecting the NY police to protect protesters is a wee bit naïve.
When I was in Caracas at a huge street gathering of Chavistas who gather regularly to hear El Presidente speak, I saw several of them manhandling another who appeared to be one of them out of the crowd. I asked someone what was happening and was told it was a not too uncommon occurrence of the people policing their own. “That guy was feeling up women.”
It may be a bit more difficult, but OWS participants are going to have to protect themselves from the inevitable creeps. Figure it out. Or lose. Reality bites.
....but hey, do what you want....you will anyway.