DougR - The military is famous for the phrase "The Captain Goes Down With The Ship" (Not to be confused with the Capt. Goes Down on the ship which is totally different, and also violates the don't ask don't tell regs.) Quite a few skippers have been scuttled because the persons in their charge ran into another vessel or did something while they, the captain, were asleep in their cabins. It happens all the time.
What happened, happened. That he may or may not have known what was going on doesn't necessarily matter. According to accounts from the Red Cross they warned the pentagon months ago that this sort of abuse (torture) was going on. That the people they told didn't pass it up the chain is as telling as Rumsfeld not checking on the conditions of the prisons. Certainly someone up above must have thought about it once in awhile. Holding a portion of the indiginous population and caring for them must be somebody's concern. Or was it as half assed as the rest of this seems to be?
So where does the buck stop? I can tell you that if it were my ship I'd be writing my last will and temperment!