He don't know us very well, do he?
Why do people not realize that all tightened laws will mean is that the black market in stolen firearms will skyrocket. A person, like the Tucson shooter, who is bent on destroying will accomplish their purpose with either stolen firearms, edged weapons, or clubs.
Far better would be, as we are trying to do, to create an armed, polite, self-policing society in which the criminal and, unfortunately, the mentally unbalanced would not be able to carry out their violence.
I say "unfortunately" in the case of the mentally unbalanced because these are people who need treatment. In too many cases, they do not get it or they get ineffective treatment.