This is not entirely true. All the political parties and ideas from back then are gone. The government was replaced completely multiple times and time has changed to the better. IMO the past is not hidden at all in fact we are regularly reminded about all these things, we just embrace our better future.
Are they? There's plenty of far-right parties in Europe, some of which have even entered into governments or came close to it. And in any case the core threat isn't fascism per se, but the darker aspects of human nature which remain unchanged. The USA after all didn't have a fascist government in that time period but nevertheless performed widespread involuntary sterilizations. More relevant to the circumstances under consideration, the CDC itself performed secret experiments on human subjects as recently as the 1970's--infecting black men with syphilis without their knowledge, just to watch the results. Or the 1980's when the FDA an CDC turned their back on AIDS victims for political reasons, because it was largely gay men who were dying.
Europeans seem to think that they are above all this and such atrocities could never, ever happen again. But history shows otherwise, and human nature remains the same. Checks and balances and eternal vigilance is how you make sure it really doesn't happen, which requires the belief that it seriously can happen again.
As said I don't think Europeans generally think that way. We are very aware about things that happened, sometimes more sometimes less, but we have a long history we are not always proud of and build our future based on that knowledge.
We do not have, and also never really had, this kind of far right here in Switzerland. Our most right party is very liberal. I think you are generalizing Germany to Europe.
