I read about it yesterday. There were a lot of parts of this case that would have been difficult to try for a military tribunal, even worse for a civil trial. Did he do it? God only knows, and he's not talking.
Having read about, and talked to some of the vets of Falluja, I can tell you it was serious bad-guy land, even for a hard-core seasoned soldier. It was a CF from the beginning, and only got worse.