Why are kids killing kids?
Lets look at our fine heritage (Western European). Over a period of at least 200 years (some historians say 400 years!), beginning about 1100 A.D., tens of thousands of marauding Crusaders (many of whom were teenagers) brutally and senselessly killed tens of thousands of innocent men, women, children and babies, all in the name of the Pope and Christianity.
The Crusaders included German, French, British, Spanish and Italian mass murderers. Why? Silver in their fillings? Vaccines? Antibiotics? Air pollution? Steroids? Food additives? Junk food? I don't think so.
Wrong diet? maybe. According to Dr. D's maps on blood type evolution, at about 900 A.D., Western Europe was becoming predominantly type A after having been type O for centuries. Could it be that the urge to kill was due to type As eating meat, or type Os eating grains? Maybe. My point is that many of us come from a gene pool with an established history of violence, even in the name of religion, long before any of the modern day environmental/nutritional issues existed. Food for thought (pardon the pun).