Well, I know I've said in the past that cultural feedback has to play some role. I just don't think we can attribute endemic violence predominantly to that, since there's no way to distinguish between factors like poverty, urbanization, gun access, cultural image, etc., especially when these things likely combine and give rise to circumstances that wouldn't necessarily turn up in a different country with a very different history and demographic layout (additionally, it's impossible to separate cultural image/feedback from the historical conditions that give rise to them). I don't think that reform is entirely out of anyone's hands, but I do think that efforts need to be made on multiple fronts.
I've said before that I think educational outreach would be one of the best things for inner city youth, but I don't know how to implement that.