We had a kid up here in MA who stabbed another kid in school and excitedly wanted to help the cops take pictures of the crime scene- that was aspergers. Maybe Judah would have an opinion here since I think he's a psych guy.
Some guy who works with autistic peopel responds:
There's definite links between aggressive actions and autistic spectrum disorders, evidenced both by my experience and by the evidence. It comes from a bunch of sources, depending on the nature of the autist. For instance, I deal with a lot of aggression because the resident feels like they aren't being understood, or they have a problem that they can't express, and they're frustrated to the point of lashing out. Usually, after we've been struck by a resident, the first thing we do is check them for wounds and injuries, because if you're non-verbal and mentally retarded, how do you tell someone you sprained your toe? Usually, the actions are in-the-moment occurrences rather than planned & premeditated actions of that sort.
I haven't heard of any definitive link between premeditated violence and ASD, but I suppose it's possible for high-functioning autists. It definitely wouldn't be possibly for the vast majority of people with autism because 3/4 people with the condition can't live on their own.