We don't have politicians, government bureaucracy, or even political system that can be trusted with limits to the right to defend yourself. We know what lists lead to. And we know criminals won't follow the law, anyways. Nothing you suggested would have stopped this drug deal from happening in the corner of a WalMart parking lot.

Change isn't hopeless, but it starts with growing individuals - at home and macro-economically - not with infringing people's rights.