Would the death toll be less with hand made explosives? I heard that it was certainly less because his semi-automatic jammed and he had to switch to a hand gun. Certainly can't think of an argument for allowing those out in public.
With home-made explosives, the problem there is avoiding injury to yourself. Most people who make explosives don't intend to be there at the time of detonation leading to problems of remote detonation. Those that do intend to be there don't usually intend to survive.