Comment by Amezarak

There are modern European states refounded after the Allies pursued a deliberate and calculated policy of ethnic cleansing to ensure Germans would never be a problem again - in some cases going from 25% of the population prewar to 1% afterwards, with mass violence and rape included. Ethnic cleansing is only really frowned upon when you lose, or when you win so hard it's a convenient virtue signal and disapproval doesn't threaten the status quo.