It is silly to restrict firearms at all because not only do you depend on guns to defend you from gangs, mafia, psychos, rapists, etc., but you depend on guns to defend you from foreign threats as well.
But the problem is that if you don't want to have to be responsible for actually doing it yourself, you prefer to make others do it, even though by irresponsibly evading your personal duty, you risk this country being turned into a police state by corrupt politicians.
Clearly the founders instead wanted each and every able bodied person to do their part in defense, so that no corrupt mercenary police force or military could ever threaten our democratic republic. And you would throw that all away.