I can agree with that it'd be counter-efficient to go after police (the direct action protest groups I'm familiar with would not do this), but how many infractions of civil liberty was the police itself responsible for during those years? It wasn't exactly a balanced time, was it? I would never defend a bombing, but when people are face to face with a system that is brutally unbalanced, people may easily slip to the side of drastic action, typically representing the tip of the issue. But, as said, that may be irrelevant to the motives actions taken by this group. I'll shut up about the weathermen until I've read more about them.
On a related note though, shouldn't this resonate well with the compound-having, gun-toting, my foot on the state's snake-head extreme right?