Well I've no problem with by-standers jumping to the guy's aid and I'd like to have seen that but it's difficult for being to get involved when that type are swinging knuckle-dusters. I'm not sure if that's what @Raven is suggesting or something more organised as he hasn't elaborated to that extent.
The existence of a loose anti-fascist organistaion in Ireland has predated this rise of the right. The theory is reacting has never been enough, it must be aggressive and proactive, This thesis is interesting read and has a nice chapter on the absence of a Right-wing in Ireland. Interesting read. Karl Popper is also worth reading on it.