The shooter has Aspergers syndrome. It's a mild form in the Autism spectrum under DSM IV. Most people with Aspergers are really intelligent, but they can get frustrated easily. Hence the argument he had the day before the shooting with some faculty members or something. It's really difficult to understand why such violent behavior with Aspergers from this shooting from what the experts say. I cannot relate to anything about myself being that violent because I have Aspergers as well. I take medication to only keep me focused on the task at hand plus keep myself controlled and I do have a Psychiatrist. I presume he had them, but didn't understand self control when he was this furious. In every article related to the shooter, there is nothing listed for several reasons. 1. Privacy from the public. 2. Americans placing threats to the therapists about this situation.
http://xfinity.comcast.net/articles/news-general/20121214/US.Connecticut.School.Shooting/?cid=hero_media
Uh oh... apparently Nancy, the mother of the shooter loves guns... http://www.slate.com/articles/double_x/doublex/2012/12/why_did_nancy_lanza_love_guns_i_bet_i_know.html