ASAN covered this one pretty well. The important part:
Recent media reports have suggested that the perpetrator of this violence, Adam Lanza, may have been diagnosed with Asperger’s Syndrome, a diagnosis on the autism spectrum, or with another psychiatric disability. In either event, it is imperative that as we mourn the victims of this horrific tragedy that commentators and the media avoid drawing inappropriate and unfounded links between autism or other disabilities and violence. Autistic Americans and individuals with other disabilities are no more likely to commit violent crime than non-disabled people. In fact, people with disabilities of all kinds, including autism, are vastly more likely to be the victims of violent crime than the perpetrators. Should the shooter in today’s shooting prove to in fact be diagnosed on the autism spectrum or with another disability, the millions of Americans with disabilities should be no more implicated in his actions than the non-disabled population is responsible for those of non-disabled shooters.