It does seem like the right doesn't really get the difference on this.
Anyone who commits this kind of atrocity is a nut, period. When there was all of the outcry about the guy in the AZ shooting being a "rightie", it was more to do w/ the rhetoric that came from fools like Palin and campaigns that used crosshairs to target incumbents that caused concern. It wasn't "well, this is a Tea Partier, so all Tea Partiers are like this."
When it's a Muslim, it DOES become "well, this is what Muslims do." We see an endless stream of threads citing the "religion of peace," and painting the entire religion w/ the brush created by a couple of lunatics. And those who subscribe to that faith really feel it, on a very pracitcal & threatening level.