Oh, Jeff,
that is exactly the whole problem. If we don't work through what happened and acknowledge the horrors of the Nazis, then how shall we ever prevent such an occurrence in the future?
Imagine, for a second, that there had been no change in the underlying culture of educated, influential Germans. Picture this: The entire basis for accepting responsibility for the Nazi atrocities, the rational for "never again war", the justification for educating our youth and trying to, if only, symbolically, make reparations for what had happened were only based on what the Americans said.
Fine enough, as long as the Americans were led by people such as Truman, Eisenhower, Nixon, Carter, Bush#41, to name only a few. Men who stood for social justice and human rights. Men who tried to avoid war and, if war proved unavoidable, went before the UN with the facts to plead their case. Easy, when the culture and government of America is so noble.
But, what then when a president should arise or a scandal occur, when an ambassador be found out telling lies, or, yet, a grave breech in relations, a disagreement over justice and treaties should arise? Would we want German peacefulness and awareness of the evils of torture and suspending civil rights to be cast aside as the moral superiority of the US came into question? Surely not.
Germany permitted itself the worst of all sins, the sin of self-indulgence. At the time the Nazis seized control, their "seizing" was more a case of "being welcomed with a nod and a wink". You can only prevent such things when a concept of true democracy, true government of the majority without abridging the rights of the minority arises from within.