idk who you're trying to blame here but the guy was a sociopath to begin with, nothing that can be done about that
I'm not blaming anyone here for this guy shooting up a school. Reread my comment.
Also being a sociopath doesn't make you fated to shoot up a school. A certain series of events got him started down this path, and if he hadn't been able to justify killing people with his political delusions maybe he wouldn't have killed anyone.