Romney's people were in the wrong, there were tons of state police there all they had to do is ask one to help out if there was a problem, rather than taking matters into their own hands and making a scene. However, and keep in mind I was actually there, the RP supporters weren't in the right either. Instead of picking the whole thing apart, let me just say what my wife who is not a Ron Paul supporter said about it as she was waiting for me on a bench directly across from where this happened.
She told me that after seeing how the Ron Paul supporters act, she has no intention of ever supporting Ron Paul. It took me a good long while to convince her that its a minority of supporters that become agressive and cross the line. She also told me that the guy who had his sign stood on was screaming and swearing directly infront of another supporter and his children. She said the man covered his children's ears and asked the angry supporter if that was necessary.
I stayed out of it, I'm not going to allow myself to be associated with that sort of behavior. Its good to support Ron Paul, but not good to push it to the point of giving him a negative appearance. My wife also said that the chairman who ripped the sign out of that guys hand was talking on the phone to Romney asking him where he was (Romney did show up later, gah he is so out of touch with most American's). She said the chairman told Romney that Ron Paul's campaign manager had some very good points, but his supporters are insane. I know you wont care about that, but it is good to know what your opponents are saying about you. Also, what some call insanity isnt really insanity its just passion.
So what do I think you should do. Well, I think you should be aware that both parties were in the wrong and I do actually hate that jerk that was standing on the sign. I'm not going to make a big deal out of it because I know it was a situation where most everyone was being respectful, yet about 3 or 4 on both sides turned it into a bad thing. You of course can complain if you want especially if you weren't there. Definitely feel free to complain about the guy that stood on the sign cause hes just plain repulsive in person.
You never know if people who act out in a situation like this are actually nuts (there are some in this world), or are agents provocateur secretly working for the other side. In all cases. step back and videotape. Disassociate and retreat from the occasional crazies, whether they are really crazy or agents provocateur you may never be able to find out.