"Apparently there were 5 other incidents at the same "Nightclub" "

That's doesn't sound like just the odd scuffle you might get in the best run pub, that's a venue which is seriously out of control. Coming down hard on the actual thugs is necessary enough, but it's only part of what needs to be done in that kind of situation.

I don't know if that counts as "good liberal sentiments" or not, but I am pretty sure that that is how the police would be likely to see things.