A belief in non-violent social change means you actually believe that violence is wrong and also self-perpetuating, and you try to live by those values. You don't get a pass for being on one side of an issue or the other. The statement from GLAAD condemning the actions at the FRC was on point, and I thought Perkins also spoke well by focusing on the guard who averted tragedy.
Like the killings at the Sikh temple, this incident has an ominous political or ideological edge to it. Crazy people like the guy in Aurora may spawn copycats, but this kind of thing can perpuate itself in more sustainable ways.