The young murderers in Colorado waited longer than any waiting period ever suggested before carrying out their well-planned orgy of death. Such bans would not have applied to the kinds of guns that were used. The Columbine killers had already been given a clean bill of health by shrinks running such programs. So had the young killers in another school mass shooting. The track record of psycho-babble is miserable, however popular it may be in the media.
Some people support gun control laws simply because they are opposed to guns.
We may all agree that the world would be a better place if guns had never been invented. The same could be said for everything from bows and arrows to nuclear weapons. But there is no way to unring the bell. The only options available to us today involve choices about what to do now, given that all these deadly things exist and cannot be made to disappear, no matter what kinds of words we put on paper. In a country where there are millions of guns available illegally to criminals, the real question is whether we should allow potential victims be armed as well.