I think, though, we have a pretty good overall picture of the organized crime family that was the Bush-Cheney Administration. It leaked like none since Watergate. That, in itself, tells me that even in the darkest days there were still plenty of good people left in gov't.
As for accountability, in Washington today the default position is to do nothing. Some around Obama probably have made a convincing case that putting BushCo on trial might be more trouble than it's worth, but keeping the possibility in reserve might be useful. That's a very short-sighted view, as we've seen the results over and over again since the Church Commission. The same perps pop back up into power, and just commit bigger crimes.
Almost makes one wish for a Star Chamber and a police to police the secret police and to spy on the spies. But, then, who holds them accountable? I'd like to say the people, but that probably assumes too much. Sigh.