Agreed, the left is in full "Lord of the Flies" mode. It's worth noting, too, that the Democrats' recapture of a majority in Congress has not halted this trend. Quite the opposite, in fact - they've grown ever more shrill. A few election cycles ago, I worried that a Democrat victory would bring about an insufferable leftist gloat-fest; now I think there's something considerably darker in the offing.
They have discovered our system carries the very real possibility of them losing the ground gained through manipulation and demagoguery in the first place, and they are determined not to let that happen "by any means necessary."