When certain obstructionists become too irritating, label them, after suitable build-ups, as Fascist or Nazi or anti-Semitic ... to discredit them. In the public mind constantly associate those who oppose us with those names which already have a bad smell. The association will, after enough repetition, become 'fact' in the public mind.
It is incredibly easy to debunk the ridiculous tales; just look under the rock and see for yourself.
Revisionists are just the messengers, the absurd and impossible 'holocaust' storyline is the message.