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However, they ARE personally and policitally (and, if necessary, morally and criminally) accountable for the outcomes of their political actions and omissions.
Julian,
I certainly don't disagree with this statement, but would like to point out the importance of the bolded word. People should only be accountable for those things related, as you state, to their political actions or omissions. Merely being 'in command' does not meet this criteria--there are numerous things that could go on below your command level that you have no control over or knowledge of. You shouldn't then be accountable for those things, unless it can be shown that they occurred due to a specific action or omission on your part. Currently, I haven't seen anything linking Bush to any of the activities in the prison abuse issue. He would therefore be no more accountable for these activities than he would, for example, be accountable for someone in the military getting drunk and running over someone. Now that the issue is known, however, he can be on the hook if appropriate actions are not taken. As for Rumsfeld, it remains to be seen what involvement, if any, he might have had.
As I pointed out in a separate thread, it does seem to me that, at the very least, there was a lack of supervision at this facility, which someone somewhere is certainly responsible and accountable for. Exactly where that particular buck falls has not been determined. Also, there is certainly the possibility that these actions were taken under orders (or, as you point out, direct omissions), the responsibility of which should certainly fall on somebody's shoulders. So far, though, that somebody is unknown. So, demanding accountability before identifying the responsible parties seems a bit premature to me.