The Holocaust was something so nasty that no horror writer, not even the great ones like Clive Barker or Stephen King, has ever thought to use as a backdrop. There are things that are just too horrible for horror fiction.
It wasn't only Jews, you know. Disabled, Gypsies, homosexuals and Jehovah's Witnesses also made that cattle-truck trip to Hell and there were more. It cannot be made into any form of entertainment.
Unless you are of the preferred groups. In which case you can make stories of love within the piled corpses or of bravery in the face of the ovens and the gas. Such stories make us feel good but they are not the real story.
Tell it as it really was and you are boycotted.
I only watched the less-than-a-minute trailer and that alone was nasty but that is what really happened. It wasn't bloody Disneyland they went to . It was gas and the extraction of gold teeth with pliers and the removal of rings by cutting of fingers and bodies piled in pits, not necessarily completely dead at any stage, and it was absolutely evil.
Boycotting such a depiction is equally evil. This is what happens when a section of society is declared non-human and denormalised. This is where it leads. Everyone should see this film.
It will make you sick, yes. It will horrify you, yes. You will have terrible dreams about it, yes.
But if it is shunted away under the carpet as the gentle souls would have it, there can only be one result.
It will happen again.
It is horrible but it really happened, it was done, and it was done not by monsters and demons but by people like you and me.
Face it. Otherwise we can never change it.