Until parents take on the responsibility of teaching their children about responsibility and the proper handling of firearms, there will always be trouble with kids and guns. The violence on TV doesn't help but parents can be more selective of what the kids watch.
I know how hard it is nowadays with both parents working. Kids don't get the attention they need. They start out at day-care then go to pre-school then regular school, from one person to the other for the first six years of their lives. They see their parents in the evenings and at night.
Something is wrong here. Kids need stability to grow and mature and part-time parents simply don't cut it. So kids turn to gangs. They need to feel they belong somewhere and it's a sorry story but they feel connected in a gang. If they can't get that feeling at home they'll go elsewhere.