So here is the elephant in the living room: Why did the kid have the gun? Becasue he was bullied and didn't feel safe. What is the single common factor in every recent shooting incident going back to Columbine and beyond? Bullying and social isolation. In addition to the shootings there has been a 20% increase in the rate of teen suicides since 2000. The common reason? Bullying. These phenomena need to be viewed together. Don't just look at the gun violence. There is a root cause and we're overlooking it.