Retired from law enforcement and I would never stand there and let someone slap me repeatedly. If they wanted to get a shot in it had better be a good one because it would be the only one.
I know it's the "in" thing these days to say cops are always wrong. Sure, maybe they could have restrained the woman but their goal was to get her out of there ASAP for her own safety as well as their own. Saying, "Please ma'am, put you hands behind your back. We're going to place you in handcuffs and remove you from the premises", would have been a bad tactical move. The people she was bothering would have had more time to be annoyed with her. Also, anyone who was with the woman would have had more time to give the cops grief for hassling her even though she was the problem. It's not like the cops picked a random woman to drag from her seat. They were called there for a reason.