My point was simply that it is already against the law for a mentally incompetent person to buy a gun and that no other “gun law” could do more than that.
I was, rather, trying to point out a rather large and gaping hole in the President's discussion of the matter.
If he had to talk about Tucson, he could and should have stopped with "we need to enforce the laws that are on the books" and left it at that.