For the last it matters because upbringing influences perspective. I grew up on the "inside" of the violent , dysfunctional world and if the gangs were disarmed then I do not believe there would be a significant change in killing. Why? Because killing is cool. It brings you into an exclusive society in gangs. It's culture. Guns? Having a full auto weapon is awesome and I'll not deny it's a lure. But those an all else were gone, the structure, the culture, what it means to be a man would continue. You hear about Zimmerman and you may have arguments in your favor. Quick, how many people were knifed to death in Philly last week? Damned if I know and that's where I grew up. So I did a search for "death by +knives philly"- note the +.
I got this as the top result.
http://www.philly.com/philly/news/364274961.html
How many deaths by stabbing? Hell if the Inquirer or Google cared. What I can tell you by way of an anecdote from my living there is people die of guns but most of my acquaintances bled out from a silent attack, not a gun.
That brings us to a discussion of risk assessment. How likely is someone to die of X? If I died because of a gun or a knife or baseball bat, which is objectively worse? How much does looking at a gun make a shooting more likely?
It's all valid for discussion but that's hard to find. Guns are fine. Guns are evil. That's often the basis for a thread. Pick a conclusion and work to find the means for justification. Sometimes valid points are blown up in significance to become "score one point for the team".
I shall now ponder angels on the head of pins.