You're not paying attention, C: Wayne LaPierre and the extremist NRA in practice defend the right of all Americans to own all the guns they want: they make some of the right noises in public, though not often, but they still assert that the answer to bad guys with guns is good guys with guns, they never saw a gun control measure they actually liked. As to keeping guns from whackos, the active issue is how we identify whackos, and the NRA consistently advocates for a very narrow definition, which effectively eviscerates any attempt to keep James Holmes et al. from shooting at the rest of us.
I personally don't give two shits for Heller, or for the conservative bloc on the current USSC, a couple of members of which I suspect of being clinically insane, and at least two of being clinically brain-dead. The truth is this: at the time of adoption of the BofR, and well into the 1800s gun control was a common feature of the American landscape, and the 2d leaves a lot of room for stringent requirements. That we don't regulate transfer and ownership of guns, particularly those expressly designed for killing people, in the same way as the rest of the developed world suggests that we're the most backward nation in it. Discussion of what Heller held, in light of what Dylann Roof did, is just obscenely stupid.