Dave: Something about that Post piece bothered me. I think it's right here, in a genuine nutgraph. I've hightlighted the key sentence:
What's notable about this isn't only the level of anger but the direction from which it is coming. Not that long ago, it was the right that was angry and the left that was, at least comparatively, polite. But after years of being the targets of inflammatory rhetoric, not only from fringe groups but also from such mainstream conservative politicians as Newt Gingrich, the left has gone on the attack. And with Republicans in control of Washington, they have much more to be angry about.
In other words, it's okay. Just payback time, in response to what the crazy right started. Though somehow I don't recall coming across loving portraits of Montana militiamen in the Post's Style section back then.