The concept that the government could or should only “allow” certain people to buy guns stands the very concept of American jurisprudence on its head. It presumes that the government knows all, controls all, and should be doing so. It is wrong and ineffective. It is the opposite of preventing criminals from possessing guns.
It is crazy to set up a huge expensive bureaucratic system, require everyone to jump though hoops and prove that they are *not* criminals in order to try, ineffectively, to prevent the few individuals who are not responsible, from having legal access to guns. This is a failed paradigm, and it should be abandoned. To accept the idea that the all gun sales should be monitored by the government, and only allowed to those it deems satisfactory is fundamentally wrong.
The entire idea of the enterprise has always been the death of a thousand cuts, where the restrictions on who can buy, and where, and how and what are continually increased until the number of gun owners is reduced to political insignificance.