Simple.
Everything about everything we have been told is someone else's story, whether this be factual or otherwise. In the case of the moon landings only 3 people went up to space and many belive the footage was staged. Aside from the video footage of them and people saying they have seen their footprints through cameras we do not know for sure that we went to tm the moon unless we went there personally. Same with the holocaust In a way. I for one don't know ow anyone who was in ig or remotely affected by it, not surprising people doubt it and many other things the government and the media tell us