Comment: Except that there were eyewitnesses to it.

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In reply to comment: It has always been strange to me. (see in situ)

Except that there were eyewitnesses to it.

Jews, Germans and non-Jewish non-German eyewitnesses.

And there were the eyewitnesses and participants in the science who testified first hand.

And there was the testimony of the Capos, and SS soldiers there, and Jewish survivors, the few there were, all substantiating each others accounts, and locals, and ex-NAZI party members, and the meticulous SS documentation and, and and...

So, nice try "hannamontana".