I don't think we can excuse this evil by mental illness. I hear he destroyed his computer hard drive in advance. Thomas is right that "there but for the grace of God, go I". We all are flawed and we are not basically good. Why do we spend most of 18 years trying to teach children how to behave and work so hard to instill virtue? Only God can know the extent of this young mans infection with evil and how it is the infection destroyed him. I also believe each of those children killed is now safely enfolded in the arms of Jesus. Went to performance of "Messiah".