The question in itself... About what a "citizen" should or shouldn't be able to do is the problem...
The "Real" question is why does the Gov't need a multi-warhead nuclear missle and a cumulative Arsenal to destroy the entire world's major cities without even blinking an eye!
Gov't has limits... Not the "People"...
The argument is flawed because the person making such an asinine statement understands very little about our form of Gov't and our Constitution!
“We are fast approaching the stage of the ultimate inversion: the stage where the government is free to do anything it pleases, while the citizens may act only by permission"
Ayn Rand...
Why do you need more than ONE gun ?
You can only fire one at a time.
If there were a major war, enemies would target every nuclear resource we have.
We need a lot to ensure that some would remain.