Adam Lanza was also on the autistic spectrum and so was Seung-Hui Cho. There is no evidence whatsoever that George Sodini, the Columbine shooters or Elliot Rodger were on the spectrum although they are often said to be. Rodger was a pathological narcissist, one of the Colombine shooters was a sociopath and the other one was depressed, and no one knows what if anything was wrong with Sodini.
His mother confirmed that he was an Aspie in online posts. As a boy, he was a “headbanger” – that’s not a metalhead but instead is someone on the spectrum who likes to bang their head against walls.
Chris Harper-Mercer, the shooter, had access to 14 guns. It was thought that those were his own guns, but as in the Lanza case, instead they were owned by his gun nut mother, a nurse.