The actions of the Nazis TTL cannot be merely described as atrocities. If they were JUST atrocities, then one can question the A4 and their harsh treatment of the Germans.
OTL, a Jewish state was created, Paris is still proud, and Poland and Russia still have lots of people.
The Nazis and their acolytes left permanent scars on Europe. There is no Jewish state, because almost all of Europe's Jews were murdered. The city of Paris is a ruin, decades after the genocide of Slavs, their numbers have still not bounced back, and the Russians and Polish have to PAY people to immigrate there.
Simply put, the Germans have gone beyond the moral event horizon, by doing things they will never, ever be able to undo.
Someone ITTL only needs to point to a picture of an empty field that once held a Ukrainian city to explain why decades later, Germans have not been forgiven.
I imagine ITTL, German kids burn their family photos, as they themselves have nothing good to they about their ancestors.