It makes me angry when people thoughtlessly say he had Aspergers syndrome, because at this point in time its never been proven and the some of the symptoms he was exhibiting were far from what you find in the disorder. Yes Aspergers can coexist with other illnesses but I dont think he had it, and certainly not the classical kind.
I agree, although one might argue that a major indicator is social isolation, possible sensory sensitivity issues along with his preoccupied obsession with serial killers. But thats it. However, none of these alone are an indication of Aspergers because many other illnesses have the same characteristics. He was smart, but had serious issues. The social isolation could be from psychosis, especially in the last 3 years before he acted out. Sensory issues are just casual reports from the few who knew him, not yet solidly proven. The serial killer obsession could fall into OCD or Aspergers, but it could have been fueled by psychotic level thought quality. The picture of him is another indication of something outside of Aspergers. His eyes are very vacant and disconnected. Serve depression? Some type of dissociation? Psychosis? Im not talking about not making eye contact as with typical autism but rather something very amiss.
The Adam Lanza case if fascinating from a clinical/developmental psychology perspective. I am constantly analyzing any new news updates / looking for new info. Many, many complex psychological and psychiatric symptoms are present and I have read almost every single theory you can imagine as to what went wrong in side his head. If I had to pick I would lean more toward undiagnosed schizophrenia rather than autism of any kind. But its still a guess at best.
At this point what we all need is more info on Lanza, especially his early years. Hopefully medical records will go public along with people coming forward who knew him as to what they saw. I think that will show more of a promise as to what he had. One thing is certain, a lot of people missed a lot in him.