Decades of imprisonment for actions that while he supported he never implemented anything that led to the killing of innocents.
He served his time because of his political Weltanschauung was anathema to the Allied Conquerors of Germany.
Dunno, Hess was totes in favour of blitzkrieging and defeating 7 countries. Thousands of dead civilians, and he didn't mind a bit.
When he flew to scotland in 1941, hitler's biggest worry was that he would blab about the coming invasion of russia, but he didn't. So he played a small part in that as well.
They all had to go dutch on the butcher's bill.