That's kind of funny. I can't believe I am going to say this, since it's going to sound like I am defending this crew, but it's possible for people to go their entire lives without getting the diagnosis. It's really only become "popular" in the past 10-15 years or so, which means many adults may have shown signs as youngsters but they were ignored. I know many people who were diagnosed until they were in their 30s and 40s.
Doesn't really matter, though. They could try to use that, but having Aspergers doesn't make one more prone to violence or murder. In my experience being married to someone on the spectrum, it seems to go the opposite way.