There has to be more to the story. A healthy, normal person doesnt drop out of school, then goes and kills 12 people. Do you really think he did this ONLY because he dropped out of school? Seriously?

People do crazy stuff over all kinds of small things all the time! Is that really so unbelivable?? Yesterday I read about some guy putting an automat boat worth 20 mill dollars on fire just so that he could get home from work earlier! Now he faces life in prison.
So no, it wouldnt surprise me at all if that was just the case. Even his parents was not surprised that he did it, indicating pretty much that their son is not a stable human being at all. Guy looks far from normal.
But Im not saying there isnt more to the story, I was merly just making an assumption earlier.