Maybe it's because these kids were largely ignored by their parents when they were growing up, became depressed, parents again ignored them by medicating them, and the kids took things into their own hands, however extreme. (This is not saying parents who work ignore their kids.)
That's another way of looking at or saying the point I was trying to make.
I'm not sure if you're aware, but all those antidepressants called selective serotonin re-uptake inhibitors, SSRIs, such as Prozac, Zoloft, etc. have new "Black Box" warnings on them mandated by the FDA because a small, yet significant, potential for suicide. Their potential for homicide has largely been ignored.
Thanks for reminding me. I should have bookmarked the story just for those links.