You're hard press to find a major figure on the left blaming them
Hardly anyone on the left is pointing fingers.
Wow.
The level of psychic disconnect it takes to sit there and type those statements with a straight face must be galactic in scope.
Of course, the out for some of them is to protest, "Oh, we didn't say *insert conservative here* was directly culpable, we're just talking about the tone of rhetoric in geeeeeneral."
Horseshit.
I made an earlier analogy and it still stands: It's like showing a photo of an automobile accident resulting from speeding and using it as a cautionary example against drunk driving. It makes no sense unless you're trying to insinuate a connection between the two events. Otherwise, why wouldn't you use an example you knew for sure to be related to the point you're making?
No, they knew exactly what they were doing with the exploitation of this tragedy, which was at the very least to insinuate a direct causal link between conservative speech and the behavior of Jared Lee Loughner. It is the heighth of puerility to try to backtrack on that now.