What difference- or more appropriately what business is it of anyone as to how many, or what kind of firearm I, or any legal law-abiding US citizen may own? Why penalize the law abiding firearms owners who never cause problems over a handful of law-breaking people? Those who use firearms to violate the law are an exceedingly small number of people who unfortunately are typically using weapons illegally obtained. Some high-powered firearms were even provided by currently serving US government officials. Far more people are killed- 30,000 according to government supplied figures- in drunk driving motor vehicle accidents annually yet there is no outcry to ban alcohol consumption, or the manufacturing of automobiles. Far more people are killed in the US and the world via other means than firearms, yet screw drivers, pocket knives, ink pens etc. are not banned. And far more are killed in disarmed England annually than the armed US.
Last time I checked this is still the USA, land of the free. If I want to buy a Ford, nobody has the right to require I buy something else or nothing at all, or how many. But I know of 15 people killed in a Ford branded motor vehicle in Kentucky, May 1987. Further, as long as I do not harm someone else it is none of anyone's business what I do.