The regrettable conclusion I've come to is that Germany's reconstruction was more or less successful in part due to the fact that ~12 million Germans were killed during the war, if memory serves. Surely a lot of innocent collateral...but also probably a lot of Nazi slime. That's a lot of people you don't need to worry about rehabilitating, or worry about them firebombing occupation forces, or sieg-heiling Holocaust survivors, or creating a lost cause myth to whitewash their crimes, or generally trying to gin up Round 2.