You just did defend him. This cop is now a felon. Did you even read the Statute I cited?
If you're standing on a crime scene and cops are fighting with a suspect can you be moved fomr the area for your safety? And if you turn into a little punk with an iPhone and won't leave, then it's on you. Now the cops have to deal with wide-eyed (propbably drunk) gawkers who want a cool video while the other cops are rolling around with the suspect.
Again, I'm not defending the cops words and tactics. I'm saying he had a duty to do what he did. He just did it in the absolute wrong way.