To be honest, I think there's no harm done. People (especially my generation) have no fear of repercussions for whatever the do, because nowadays there are none. If someone has been repeatedly asked to leave a premises and fails to do so, give 'em a few love taps.
Old school cops used to do this a lot and there wasn't as much of an issue as there is today. People should be able to walk down the street without the fear of being jumped by a group of thugs. Bring back the ability for a copper to dish out some tough punishment. If that happens, people will think twice about doing it again and so will other people, as they will have seen what happens to idiots.
There's no point in having cops if they can't be a bit tough on people, especially when our judicial system is ridiculous and people continue to get slaps on the wrists. We have to stop this do gooder BS and shape up.