How did the Holocaust go unnoticed?

Because the world is ignorant and blind to the horrors of human nature. It is a mistake which will undoubtedly happen again, because, we NEVER learn from mistakes.

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Reports reached London late in 1941, but the British Foreign Office and the US State Department just didn't want to know about it. After all, it would have put them under a moral obligation to try to do something about it.

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The Holocaust was reported in the media in Britain and the US, especially from about November 1942 till mid 1943; and on 17 December 1942 the British government issued a public condemnation on behalf of 13 Allied governments, so it is inaccurate to say that it 'went unnoticed'. Various groups were set up to try to do something about the Holocaust ... Whether and how far this 'registered' with the general public, is another matter.

Britain, France and the other Allies did know the holocaust was going on, But all they did was sent out a poster telling Hitler to stop signed by all the allied leaders. Hitler totaly ingnored it