They shouldn't. On the other hand its more than a few and it's terrorists and criminal gangs as well as lunatics. Perhaps we can give up a few small pleasures to reduce the number of military weapons in the hands of civilians, certainly they can be registered. Well, if you can craft some language that will satisfy both the NRA extremists and the gun control extremists it would be a remarkable breakthrough. It would certainly satisfy average Americans in the middle. The right has to get beyond the notion that any regulation at all will lead to total control. The left needs to get beyond the notion that we can just make 300 million guns go away. Everybody needs to get beyond the notion that nothing can be done. Too many people are like you and me and want to have reasonable access to weapons but favor additional measures to keep the military weapons out of the hands of criminals, terrorists, lunatics, and children.