The fifth commandment says you shall not murder. Teaching that violence solves problems can kill. Violent play and entertainment can kill. Exclusion can kill. Ostracizing can kill.
Bullying can kill.
Teasing can kill. Words can kill. We have a culture that accepts and tolerates these more subtle forms of killing much to easily, and when it erupts into physical death and chaos, we are shocked. How sad it makes me to see it and to see my own part in it. Jesus sees it.