There are indeed Rabbonim that have come out against these hooligans – I seem to remember R’ Gershon Edelstein coming out with a particularly sharp statement to that effect.
But the reason that most Rabbonim don’t condemn this is the same reason most Rabbonim don’t bother to condemn people driving on Shabbos in Tel Aviv – because it will have exactly zero effect (as georgie613 nicely pointed out).
takahmamash:
Doesn’t hating on “the super frum neighborhoods of Yerushalayim” also make one “not so frum”?