This thread is quite long, and I'm sure my point has been touched on already, but just to add a "+1" to the list of folks that believe banning guns is futile, all that would happen would be that law abiding citizens would be easier victims.
It doesn't take a gun to kill someone. It takes INTENT. After all, Cain killed Able LONG before anyone had any concept of what a gun was. Murder is a much older concept than guns.
Anyone who wanted to could kill another person with their bare hands. The difference is, if we're only using bare hands, then the "vicitm" at least has a fighting chance. Now, if the victim had a gun, he would have a fighting chance against an armed criminal.
As for killing with hands... if we ban guns, might as well ban martial arts, too. And kitchen knives for that matter.