I'm all about personal responsibility and I'm hardly a drug warrior. Some years ago, I lived alone and was prescribed some medication (I was wounded in Iraq) that really made me feel like I was coming unglued. Luckily, I had the presence of mind to not do anything stupid, and flushed the meds cold turkey (contrary to doctor's orders).
I have noticed many of these school shooters have been placed on various meds (in my opinion to drug the testosterone out of them). I'm not saying the correlation is causation, and it's no excuse, but I do think we need to take a hard look at some of the psychotropic drugs prescribed to children.
If there are any drugs that actually fit the Drug Warriors' create-crazed-killers meme, they're not the illegal recreational drugs but these legally prescribed ones.