It was the Holocaust that was not easily imaginable; until proof positive was discovered on the ground many reasonable people continued to imagine a Nazi Party regime without a Holocaust. Anti-semitism does not lead inevitably to the Holocaust. We know now that it did, but it was not certain until the Wannsee Conference that annihilation was to be the policy.
In the later 19thCE the Vatican did criticise the emerging racist anti-semitism, arguing that only theological anti-semitism was legitimate. Of course you can tell people they shouldn't pray to statues but they still will. The Catholic Church actively campaigned against the emancipation of Jews and their normalisation within Christendom and in the process promoted anti-semitism of all sorts, especially in majority Catholic countries like Austria and Poland. It did not sin only by omission.
I think the current Pope is righteous, though. The last one not so much.
I don't find the peculiarites of the Prussian officer class
vis a vis the peculiarites of the multi-ethnic post-1848 Austro-Hungarian officer corps terribly convincing. I think there's more to be found in the career of Karl Lueger
https://en.wikipedia.org/wiki/Karl_Lueger of whom wiki says
I can confirm from my own reading that they are quite often so viewed. Lueger's career spanned the period during which the perpetrators of the Holocaust grew up, and as I've mentioned a disproportionate number of those came from Austria and just across the border in Bavaria. If the Wiesenthal List is anything to go by, anyway.
This might be unfamiliar to you but it isn't revisionism.