He committed a despicable act and there is no reason or excuse to possibly explain how he became so little of a human being that he could shoot those babies. He was a sick monster.
But, the article is interesting and horrifying at the same time. What happened to this person? The illustrations of his book about Granny are horrifying by themselves. Did something happen to him to make him come up with this stuff?
And his mom? In high school, wanting him to be schooled at home because he couldn't handle going to school and then wanting to send him away to college where she knew he couldn't handle the dorm situation? That doesn't compute to me at all.
The not taking offered medication seemed, to me, a tell tale sign. Would being on medication helped him? Would have stopped the shooting? Maybe, but we won't ever know.
At some point, if a person is found to me mentally unstable enough, should we somehow require medication or hospitalization? If there is a passed point of instability, seems like he passed it long before he picked up a gun.