[Taltarzac725]

Originally Posted by ilovetv

In almost all of these massacres, the killer was already known by teachers, police, counseling professionals and courts as being mentally ill with probably personality disorders than were pointing toward having schizophrenia or something related to it.

And in almost all these cases, authorities who knew it were in denial for the sake of good P.R. and their institution's image.

This CT killer will probably turn out to have a long history of wanting to kill others in grizzly, go-down-in-flames, action-movie ways:

"Neighbors have described Lanza as odd, remote, and reclusive ; schoolmates recall him as a brainiac, with a flat affect; and a longtime family friend reveals that Adam lacked the ability to feel pain. His brother, Ryan Lanza, told ABC news that Adam "is autistic, or has Asperger syndrome and a 'personality disorder.'" Police authorities, meanwhile, have alluded to the shooter's "checkered past," calling him a "troubled youth."

Greater diagnostic clarity on this matter will emerge within the next few weeks as friends and doctors who knew Adam Lanza come forward to aid law enforcement in their investigation."
Diagnosing Adam Lanza - Gabriella Rosen Kellerman - The Atlantic

That article sounds extremely speculative. Maybe, Adam Lanza was just an evil person who committed atrocious murders.