So Stellvertreter des Führers and Obergruppenhfuhrer der SS Rudolf Hess, who joined the NSDAP with a single figure party number, was head of it's Central Political Committee and deputy leader, was "hardly a beacon of Nazism"?
"I'm just wearing it for a bet gov' - honest? I was going to a party with Harry's mates? I thought it looked dead ally? Oh alright gov', it's a fair cop..."
For those of us still old enough to remember the Cold War (and it was bloody freezing in North Rhine Westphalia (Nordrhein Westfalen and Niedersachsen (Lower Saxony)), three of the original Governing Powers (The UK, USA and France) were not averse to releasing him on a number of occasions, but those nasty Soviets insisted that he remain in "HMP" Spandau because even in his maddened state, he refused to renounce old Adolf and Naziism - it also gave them more of an excuse for freedom of movement in West Berlin, when all they had was the Soviet War Memorial to guard........
The Russians (or to be more precise Stalin) thought his flight to the UK was part of an abortive plot for the Western Powers to make peace with Germany and leave Russia to face the Wehrmacht alone. Hence the Russians always blocked any attempt to release him.
His life sentence was the result of wheeler dealing among the judges: see Bradley F Smith - Reaching Judgement at Nuremberg. The Russians wanted him hanged, a couple of the western judges wanted a lighter sentence.
(Basically, although the judges were sworn to secrecy, one - Francis Biddle - kept notes about how the verdicts were reached. The notes were found after his death and used for the book mentioned above).