The black bloc are Anarchists. Everyone knows that. Anarchist propaganda websites have held up the black bloc freaks as wonderful heroes for many years now.
superpatriotman (Why would a DUmmy have that as his handle?) relies on the typical defense: If someone on our side gets violent and there's no way for us to jsutify it without looking stupider than usual, than he REALLY must have been an agent provocateur for the cops!