The narrative is that it absolutely did happen, and that you're an awful person if you even think to ask questions about it. It doesn't matter how much evidence turns up to contradict the claims that six million Jewish people were sent to camps to be put to death. Happen to notice the number shifts anywhere from three to 11 million? You're antisemitic! Point out the fact that not a single survivor of the Holocaust has a numbered tattoo above six digits? You're antisemitic! They don't want you asking questions, because the story they've crafted does not hold up.