> It really is a remarkable achievement by the propaganda departments of the victors of the 2nd world war [...]

We know about the horrors of the Third Reich and the Holocaust in large part a) because of the survivors and their accounts of what they lived through and because b) the Nazis kept meticulous records of everything they were doing.

I find it in very bad taste to reduce this to "propaganda by the victors", apart from the fact that it just reduces to the (incorrect) trope of history being written by the victors: https://history.stackexchange.com/questions/5597/is-history-...