Modernity simply faded when its Old Believers stopped breathing and its Young Initiates stopped believing

Despite all the commentary to the contrary, there is actually no hard evidence that the western world really changed its views on racism and eugenics after the revelations of Auschwitz.

It just could be that the people who had always opposed it got much more vocal and those who had always espoused it learned to curb their tongues ----- at least in public and in public opinion surveys.