It appears that the author of the letter was trying his hand at satire. I guess he was trying to show that the Second Amendment is outdated, just as he's suggesting that the Third Amendment is outdated.
In any case, he's no Jonathan Swift and should probably at least give up satire for Lent, if not permanently.
He's also wrong about the Second Amendment, but we already know that.
Nothing here worth talking about.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper