As to your last question, "Is there anyone who doesn't wish someone else at Sandy Hook, had a gun?" You might have missed it, but evidently Mayor Bloomburg does. He is quoted as saying that had the principal of Sandy Hook had a gun (or any other teacher) he doesn't see that it would have changed anything.
And I would like to remind those who keep saying "Well, maybe assualt weapons...if we ban those, incidents like this wouldn't happen." No, not necessarily. Carrying extra clips and changing them is fairly easy, and people simply learn to squeeze the trigger faster, and change their clips faster. Second, what would you tell the man, see on TV, during the LA riots, who was on top of his roof, with an assault rifle, defending his family"