On what planet is this a just law?
We all agree it is a stupid, mean law. But breaking it on behalf of several entitled, violent out-of-towners not only won't do a thing to change the stupid law; it would bring even more punishment for the hostess and the restaurant.
Since it wouldn't change anything except for the worse, what use would a grand gesture of defiance be? Are you personally going to support the out-of-work staff, or pay the owner's bills without an income?