I think John Elder's point, though, was that the link between violence and the person having Asperger's makes about as much sense as saying that people who drive white Camry cars rob banks - based on a few cases where this has been true. Co-incidental information does not indicate root cause or even a link. It may be pure chance.
Does being neurotypical cause people to be violent? There's at least as many NTs who are violent, as Aspies. But being Aspie doesn't guarantee being "gentle" either. It's... irrelevant.
Even with a MI such as Schizophrenia, there is a very VERY small percentage of the people with this illness who ever become violent. For a particular individual, the disease may be a factor in precipitating the violence, but the chances of a person with this MI becoming violent isn't much different from an NT. (We had a case in Canada a few years back where someone with this MI became violent).
It's so easy to try to blame things we don't understand, on conditions that we don't understand. In some ways, we haven't come very far in the last 8000 years or so.