hmmmm... lots to think about here: high chance of facing two assailants, statistical probability of missed shots... both speak in favor of high capacity 9mm but whre are the figures on how many shots are actually fired in a civilian (rather than law enforcement officer) self-defense situation? I recall reading that a high percentage of assailants, seeing their intended victim's gun, high-tail it before any shots are fired. I'm still no convinced that 9mm is the way to go.
Laws enacted to punish evil firmly are characteristic of a government which values the lives and rights of its citizens. Laws purporting to prevent evil by prohibiting inherently harmless behavior are meant to limit rights and control lives.