Hedges is right. The question is not whether to use violence or not, but why, and what is behind it.
And M. Spector, if you want to interpret his comment in that intervew as saying "don't ever yell at the cops", fine, but I think you are taking it out of context, particularly given that Hedge's says in the same interview that he spoke out in favour of actions in Greece although he didn't support all their actions.
The point of the article is much deeper than which actions he does and does not personally support.
And NDPP, part of what I get out of the article is that the Black Bloc and the violent cops are actually on the same side. Same tactics, same enemies, same results.