You’re making it sound as if everyone got off easy. Ww2 is the reason we’re going after war criminals in the first place. en.m.wikipedia.org/wiki/Nuremberg_trials

This didn’t exist prior to WW2. While there certainly are many, that didn’t face any punishment or got to keep their benefits, there also have been those that got punished. The allies had to form a new state and rebuilt and most available personnel had worked in the administration or economy of nazi Germany before and was guilty to some degree. There was nobody else and times were changing fast. A new conflict was on the horizon and life had to go one. So they had to work with what they had.

Mistakes were made but this has never been done before. Punishing a whole country and its people is what made the Nazis possible and successful in the first place. I’d not be so sure it would be done any different today. I’d say we’d probably struggle even more and fumble the whole thing even harder.