Thank you for your reply Daisy: I didn't know he had dyslexia but that gives credence to what I'm saying, I suspect he may have learning disabilities which have caused him not to present himself as well as he might (especially in this modern age of 'spin', selfies and social media, which he has missed). I think he has definitely suffered from people judging a book by its cover and is lucky to have people like you who are protective of him.
But I think also your perceptions of Aspergers are a bit too stereotypical too: none of the characteristics you describe preclude him from being on the high functioning end of the autism spectrum - thousands of people don't realise they have it (it was a hell of a shock when it landed in our family - we thought we were all perfectly normal - that's why we hadn't spotted it

)
To me, the answers he gives in the police interviews which other people have said were arrogant, just seem like he's trying to answer factually but can't quite understand what they are trying to get out of him - the person doing the questions doesn't exactly phrase them very well either. They sound like a classic pre-ding dong chat round my dining table ;-)
There is a body of work out there investigating the differences and similarities between autistes, sociopaths and psychopaths, which have their own little spectrum as well: people were much more judgemental and ignorant in the 80s about other people's slight differences. Inoticed elsewhere that Ann Eaton used his thank you card from the flowers as evidence - possibly trying to link it to the capital lettered graffiti in the cupboard: from what you have said it shows how little she must have known the family if she didn't know it was his usual writing?
No matter how nice you are about him, there is no getting away from the fact he was a complete Klutz the way he handled some things, which as he seems to be an intelligent man he must surely now recognise and regret. So are you certain he has been tested for Aspergers? It wouldn't be the same as tests for psychopathy I don't think.