According to the British Library - Atrocity Propaganda in WW1 focused on the most violent acts committed by the German and Austro-Hungarian armies, emphasising their barbarity and providing justification for the conflict.
Investigations into the nature of war propaganda suggested that atrocity stories had been fabricated by the Allies in order to justify the war and to encourage enlistment.
https://www.bl.uk/world-war-one/articles/atrocity-propaganda#
They LIED about the GERMANS in WW1.
They LIED about the VIETNAMESE
They LIED about IRAQ
They are LYING about TRUMP + Supporters.
What are the odds that they lied about the NAZIs in WW2?
Oh I have no doubt they could do it today. I just don't think they had the narrative control in the 40s is all.
that might make an interesting line of inquiry