Sickness
A link from Wikipedia led me here. Though decently animated, it's still quite disturbing. If I hadn't known what this pertained to beforehand, I still would have sickened. There's a fanbase for shooting spree animations and games, but many of those have a message or a humorous twist, or are an attempt try to make sense of what drives one to resort to such extremes. They are made by people who (I hope) would never sink to carrying out such a thing in real life. This is the work of one who planned to do just that.
Though Weise was a decent talent and had potential, he still had worms in his brain. He had serious problems in his life (abuse, mental illness, rejection by his peers and community) and this may have been a cry for help, I dispute in not, but I had similair difficulties when I was his age. His problems were scarcley worse than mine. Furthermore, from what I've read, he had others to turn to for support whereas I literally had to bear my hardships alone. I chose to try and deal with my issues. He did not and nine people are dead as a result. Inexcuseable.
Good riddance.