Holocaust deniers are mostly Neo-Nazis and other white-supremacist types. But I know of one person in my real life who was sort of "entertaining" the whole Holocaust denial thing, mainly because he was easily duped by conspiracy theories. It's pretty moronic, through and through, and I don't have patience for people who even entertain such garbage. It's like dealing with a Flat-Earther... talking to a wall.
If you're frightened of dying, and you're holding on, you'll see devils tearing your life away. But if you've made your peace, then the devils are really angels, freeing you from the Earth.