is that almost whichever way you look at it, it is quite pointless. Even if one was to evaluate it from a my-community-first 'strategic' perspective (and there are just so many things that are wrong with such an aproach - but let's stick to the logic within the layer), it would fall flat. For the simple reason that those that came at you were not the ones you will go for. And those you go for will not be the ones who will come back at you, in the given phase or later. You will satisfy only bloodlust, not vengeance. And your actions would become the tipping point for some of those that were yet undecided.
Besides, mob violence is one of the only two forms of violence that takes no courage.