Gunman Is Described as Quiet and 'Always by Himself'. Now, I don't want to sound, er, "off," but isn't that how all alleged mass murderers are usually described?
It's like a logic problem: Not all people who are quiet and "always by themselves" are mass murderers, but all mass murderers are quiet and spent a great deal of time alone, shunning community and physical contact.
My only surprise is that the killer was Asian; if you'd have asked me, I would have said the shooter was a white male, between the ages of 18 and 30, born and bred here in the US of A. I buy the depression and the English-major... never would have guessed the Korean ancestry/culture.
So much for what I know.