SJR, unless you're telepathic, you probably have no idea from what, or if, the letter writer suffers from anything...except, perhaps, the inability to write coherently and adhere to a theme. It seems to me, Mr. Kughn was attempting to put every defense for ownership of fully automatic firearms he'd ever heard or thought of, into one, 250 word letter.
That aside, I understand why Mr. Kughn would respond to Mr. Conte as he did. Mr. Conte's assertion: "On the other side, for the most part, are men who own these kinds of weapons as compensation for their sexual inadequacy." is a prime example of painting someone else with the specific psychological flaws you have but can't recognize or to which you won't admit.