I thought that this response which I made an old friend's musings about where all these vigilantes are coming from was worth posting on my blog.
When the left went crazy in the 60s and 70s with bank bombings and attempted assassinations, Democratic officials condemned them. I can't recall a single elected official supporting any of the left-wing terror of the time. When the right wing nut cases started exploding, especially after the election of Pres. Obama, the right wing embraced them. Numerous elected officials, including congressmen, currently praise the crazies. That's why the left wing crazies died out pretty quickly and the right wing crazies just seem to keep on getting stronger and stronger.
Perhaps even more significant is the response of the media. The media uniformly and universally condemned left-wing terrorism back in those decades. Fox News and many other right-wing party organ, propaganda machines regularly praise and encourage this type of vigilante behavior. There is a causative relationship.