Your stock answer isn't working.
The argument is that the world did nothing to prevent the holocaust. Your answer is WWII. WWII was not fought because Hitler was murdering Jews.
Then you said that the world could not have known until 1941 about the Holocaust. Again, not factual. Hitler did not hide what he was doing.
Rob from Georgia gave you proof that Dachau was up and running as early as 1933.
The Allies stopped the Holocaust. Again, that was a by-product of World War II.