speaking from personal experience I can tell you Emma that Asperger's sufferers can appear to be the most sensible and cleverest person in the room.
In fact-the more intelligent they are-the more dangerous they are-to themselves. The are called the "little professors"in the shrink industry. As it's only a recently discovered condition few people-especially politicians give it credence yet it's a really debilitating condition.
I've been going through hell for 5 months now with such a person. His credible actions and talk have had the police running in circles, the Fraud Squad-you name it. Now I've had lawyers sort out the matter and we have literally had to stop the police arresting him as a serial complaigner because I know he is a very sick guy.
Ask any doctor or shrink-McKinnon has no idea what he is doing but will sound like an expert. It's a very sad condition.
(And the Harman side of my family have always been the ones we don;t talk to !!)