One thing skipped over a lot is the kid was on Suboxone, an opiate addiction treatment. However, the drug itself is more addicting that opiates themselves, and some of the side effects include violent outbursts and suicidal thoughts.
In fact, continuing in this vein, 35 of the most recent school and mass shooters have been on similar psychiatric drugs, all of which have side effects which can include violent tendencies and suicidal thoughts.
My prayers go out to the families affected by this, however I firmly believe we need to take a very hard look at what drugs are being given to people and why. Numbers this large with those side effects can't be a coincidence.
Source -
http://http://www.cchrint.org/school-shooters/ http://www.drugs.com/suboxone.html
One last thing. Racism is a real problem, and it makes no sense at all to hate someone because of their color. Hate them for their actions, assuming their actions deserve an emotion as strong as hate. And yes, sometimes someones actions do deserve hate, if they are evil enough.