(I also note that the shooter, a conservative opponent of government entitlement programs supposedly beloved of liberals, was apparently triggered by the news that he would get his food stamps reduced. Psychotics are not known for their consistency.)
As a general rule, we do not hold people responsible for when they go totally nut-bar and start blasting away. Nor would I support such a rule here. But there is a difference between what I would have as a rule of law and what I would hope for a rule of conscience. I do not expect Savage, O'Reilly or Hannity to engage in any serious soul searching or introspection about maybe they should ease back on the rhetoric -- even if they think others are worse. (I confess I am an outlier these days in my belief that one's personal ethical behavior, while informed by societal norms, really is you own responsibility, so that the argument "they do even more heinous things" is generally suspect.) To the contrary, I expect them to be highly offended that anyone would even suggest that they should have even a smidgen of second thought about what they say and how they say it -- without, of course, troubling to extend similar courtesies to their opponents.
But if conscience does not move the conservative noise machine, might I suggest that self-preservation might? Nutbardom knows no bounds. The next psycho might well decide that evil plutocrats are responsible for destroying America and decide to take an AK-47 to the local country club, or Fox News event. As we have seen in politics, what comes around goes around. Not that they seem to have learned much from that one either. The power of stereotyping is such that these guys apparently cannot dream of some bleeding heart liberal deciding to take "direct action" -- historical examples not withstanding.
Once again, I experience cassandrafruede, as I note that a return to the environment of the Guilded Age, complete with demagoguery as well as economic disparity, may reawaken our rich tradition of political violence that has mercifully lain dormant for so long.