The Left did a lot of hand-wringing during the two-week long judicial murder of Terri Schiavo about the possibility of "right-wing violence" (see here, for example). Yet almost all of the actual violence of the last couple of weeks has been perpetrated by Leftists against conservatives, and there's been nary a peep of censure from the hand-wringers about it.
Richard Perle, William Kristol, Ann Coulter, and Pat Buchanan have all been assaulted as they spoke on various campuses around the country. The attacks have not been physically serious, they involved shoes and pies being thrown at them, which says something for the level of argument to which the Left has been reduced, but imagine the outcry if, say, Hillary Clinton or Ted Kennedy had been attacked in like manner by conservative students while trying to give a speech. The MSM would be apoplectic over goose-stepping brown-shirts on college campuses seeking to stifle free speech.
As it is, the attacks do not come from the Right, so the media chooses not to rouse itself from its torpor.