In the old days it was possible to point to American Nazis and say they "deny" the Holocaust and therefore anyone who questioned any part of it was a Nazi and an anti-semite and even worse. As time passed and war propaganda wore off or by year of birth never even set it, a new breed of questioners came to the fore. They noticed that the stories did not make sense.
For these people a different name was needed even though they were still called Nazis and anti-semites as adjectives. They could not be called those names up front as they did not start from anything like like wearing uniforms and funny saluting. The name revisionist became popular but rather than the desired effect it was adopted by those not expressing religious reverence for the Holocaust.
It is this lack of reverence that makes the revisionists an object of attack. The holohuggers can not stand their irreverence even though they will delight in questioning the existence of the founder of the Christian religion (and bridle when it is pointed out that the Hebrews were never in Egypt.)
Of course I am talking about myself here as much as anyone else here. Up until 1992 or so I had never questioned or critically examined the Holocaust stories. If I thought about it at all, I vaguely assumed it was some sort of nerve gas. What got be interested was finding that the gas was either cyanide or carbon monoxide.
That set off my "reality alarm." Simply, those gases do not work the way they are described in the stories. When I looked further into it, T found details every kind of wrong and contradictory detail in the stories.
Everyone comes to questioning the Holocaust in their own way. But once coming to it they find any speaking of it is opposed with a religious zealotry that knows no bounds of decent behavior. The holohuggers are self-righteous even when they use firebombs.