Why do some people think the Holocaust never happened?

I am genuinely curious. This is a topic that is so prevalent in history classes. There are so many documents, sources, etc. that prove that this tragedy did indeed happen. Hell, this was something that happened less than 70 years ago. It's like denying that blacks were ever held as slaves. This is a given fact.... show more I am genuinely curious. This is a topic that is so prevalent in history classes. There are so many documents, sources, etc. that prove that this tragedy did indeed happen. Hell, this was something that happened less than 70 years ago. It's like denying that blacks were ever held as slaves. This is a given fact. Why are some people so in denial and so zealous about thinking otherwise?
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