Gun Control & RKBA

Against a serious aggressor, it will take serious and possibly fatal harm to halt the attack. Whether it's a face full of pepper spray, a stun gun, a baton, a machete, or a gun, the idea is to make your assailant feel crippling pain or to cause enough damage to cripple or kill them.

Perhaps one day we will have rapid-firing, multi-shot weapons that cause unconsciousness without causing physical damage, such as a phaser set on "heavy stun" in Star Trek. I can even see a future where such phasers are commonplace and widely owned, but, unlike perhaps military versions, there is no "kill" setting. Law enforcement and the general public could be limited to stun-only phasers (although according to the ST:TNG technical manual, heavy stun lasts for about an hour), and the military could have the ones that turn you into a whiff of ozone and hydrogen.