The Constitution says the "right to bear arms." The 1828 Webster's dictionary defines "arms" as :
What precisely would you control and restrict "arms" to mean ?
You're the one who wants to restrict it. I see nothing wrong with an individual owning a tank if he wants one (and can afford one). Since the founding fathers issued "letters of marque and reprisal" commissioning what at the time was equivalent to private battleships neither did they.
When you come right down to it weapons of mass destruction exist. They are now under control of the least trustwothty of all entities - governments. Governments were responsible for the murder of 60,000,000 of their own citizens during the 20th century alone. You don't have a problem with artillery and tanks etc in the hands of people like Kim Jong, but you want to see more restrictions on our God given and Bill of Rights enumerated right to defend ourselves against tyranny. I find that attitude both puzzling and disturbing. I am not worried about the random criminal taking my liberty or my property*. It is the legions of JBTs and secret police along with plunder hungry bureaucrats and politicians that need to be kept in check.
*I've been burgularized a couple of time and some individuals attempted to rob me at one time. My total losses to criminals over the years has been at most a couple of thousand dollars. Just guestimating, I've paid in excess of a million dollars in danegeld (taxes) since I started working.