I think you would find that there are a subset of people, myself included, that don't find that notion so insane. If you accept the idea that the purpose of the 2nd Amendment is to allow the citizenry to overthrow their government then having the government restrict what citizens can and cannot purchase is somewhat nonsensical.

Historically speaking, government restriction on firearm ownership is a relatively new thing. "Weapons of war" like ships and artillery were privately owned in this country as recently as the civil war.

Believe it or not, the country didn't degrade into people waging private wars against each other, mass murder, etc...