1. Vidoes and photos have been altered since the beginning of vidoes and photos. And videos and photos can be staged. Easily. Or just given a fake description that retards will blindly believe. Meanwhile do any of them show the totality of any event? The answer is no, never.

2. There are contradicting accounts of population figures, and figures can be intentionally manipulated at any time. And also don't prove anything, especially if a group has gone into hiding, refuses to accurately answer a census, or is no longer in a region conducting that accurate of a census.

So all you have is personal faith that everyone had been honest and no one ever altered anything for any personal gain. This is a broad brush statement. Actually, all of these are. Not specifically talking about Jews or genocide. So you, and everyone else, can't factually prove anything. Saying otherwise is a lie. Proof to an arbitrary standard is the best anyone can hope for. You can lie and act like you know something is absolutely certain, but no one does. They just believe what they want to believe (typically whatever their programming has told them to believe) and get angry and defensive at anyone who questions it. Basically like any religious person.