I think my sticking point with your arguments is that you seem to imply there are two possibilities to unarmed violence: death or not dying. And since death is extremely unlikely, then using a gun is ridiculous.
I may portray myself as Batman or Bruce Lee, but I am a potential victim like my friend.
He and I spent several days this year together in his New Orleans neighborhood. I could have been attacked like he was.
And I don't mean like, "In the realm of all possibilities". I mean there are a lot of attacks,
http://www.vice.com/read/new-orlean...ting-the-shit-out-of-its-artists-and-gays-820
There were also several baseball attacks on cyclists on a street I rode frequently.
http://www.nola.com/crime/index.ssf/2014/02/bicyclists_attacked_with_baseb.html
Around the Bay Area, my journeys through the most violent neighborhoods are rare and very short. In general, I'm not panicked about being attacked although I take basic precautions like being alert.
I don't want to be hurt. The last time I was attacked, in an iPhone robbery, I used my carry knife to free myself from the muggers' grasp then I ran away. I have no idea if they wanted to hurt me badly or kill me.
I think people should defend themselves rather than be hurt. But it is not a simple equation, like should you kill someone instead of being punched once in the face.