I think if there was an anti-RKBA motive behind this shot, it would have gone into a 'rat HQ, thus guaranteeing massive MSM coverage.
But I agree, we must always be careful to look for false motives and double or triple plays in such incidents.
The more desperate the gun control people are, the more intriguing their attacks will be. I believe that the end of the AWB will lead to the end of unconstitutional gun control across the land, from Kali to Mass. It'll take a couple of decades, but one after another the laws will fall. They know it.