Nancy is trying to invoke a period of 100% lefty violence and pretend that it was right-wing violence - and also pretend that it will happen again due to what she clearly regards as illegitimate dissent.
She and that witches cat Matthews, and others like Boehlert, are creating a 'frame' for future events. I have a nasty feeling that before 2010 the left are going to dispose of their bleeding albatross and make him into a martyr.