Well, that's the exception unfortunately, especially of you're on the winning side. Even in Germany, which is often held as a prime example on taking responsibility for their actions during WW2 afterwards, quite a bunch of medium to high ranked officials got away. Another example is Japan. Even fewer were prosecuted and punished for their war crimes there, even though the US were paying close attention first. It became less important after it turned out Japan could be a great ally for the US's involvements in Asia, so a lot of them could get off the hook.

If there was justice in the world, Cheney, Bush, Rumsfeld, and Obama would all be in The Hague, in irons.

There is no justice in the world.