Keep in mind that I say the following as a supporter of the right to bear arms.
Since as far as I am aware, no existing gun law was broken before he went on his shooting spree. Nor were such laws broken in the case of Newtown. So bringing out the canard that we need to enforce the existing laws before even daring to consider anything else is really really not helpful. Now if you actually have something to say that pertains to this particular incident, please do so. However, the enforce meme exists only to delay doing anything, and not just with gun issues. So unless you have something relevant to say, either shut up or go on Fox News.
It is illegal for mentally-ill individuals to purchase firearms. This individual is clearly mentally ill. Therefore, we are not enforcing the laws we have on the books, and this is basically Jared Loughner Part II, though, we do not have a failed military psyche evaluation on Rodgers record.
Do this person have a diagnose outside asbergers? Because if not, no matter how clearly you think, he's mentally ill, he's not according to the law, as such no matter how much you enforced laws on the mentally ills, it wouldn't have stopped him from gettin guns.