Any AI that would do this is unFriendly. The vast majority of uFAIs have goals incompatible with human life but not in any way concerned with it. [...] Therefore there is little to fear in the way of being tortured by an AI.

That makes no sense. The uFAIs most likely to be created are not drawn uniformly from the space of possible uFAIs. You need to argue that none of the uFAIs which are likely to be created will be interested in humans, not that few of all possible uFAIs will.