[quote=@TheUnknowable]
<Snipped quote by Kingfisher>

He's autonomous, though he is programmed to be part of a hierarchical command structure.  His heuristic algorithms blocked that command chain from being valid, however, due to there not being a valid authority figure for him to follow.  The Enclave isn't the actual US government, and he's loyal to the real, pre-war US Government.
[/quote]

The only thing I'm hesitant about is that you might be limited in what you can do with that character. I have no problem with him inherently, but are sure you'd be able to stay entertained playing as a Mr Handy?