My best friend has Aspergers....
He's a good guy, and quite brilliant.
The aspergers causes him not to understand many times interpersonal relationships...
including how close is too close, or doing inappropriate things in public places... (no not shooting rampages)
He has the same feelings and thoughts of everyone else here or anywhere
The same worries... well for the most part, because he has no job and can't ever get one...
he's afraid of the dark....
He loves video games of the adventure type, Sonic, Sly Cooper, heck even Skyrim,
He likes Anime and dislikes how American companies when they localize it take to editing the content...
He was tormented by kids in school beleaved to be the village ideot.
Aspergers is not the enemy...
Fearing a whole group of people because of a single individual is....
perhaps you should look at everything around the person and the idividual and see what could cause that boy to snap...
maybe he suffered from Depression as well...
maybe he had other mental problems...
or maybe he wanted to commit suicide and go out with a bang...(which by the end he did.)