Good question deadkenny.
In fact nobody of so called “Holocaust denied” don’t deny indeed the fact of mass execution of jew in Nazi germany- there a lot of evidence in photo and film where is the nazi mass killed the “low race”.
All those deniers which i read , just doubt in the figure 6 million of jews , which were killed in supposed death camps. Moreover after the war appeared a lot of mythical cases of jews killing - for inctance famouse “soap from the bodies” this proved to be the lie.
Moreover the cases of “dissapeaing” of millions victims of death-camps like it was in Aushvitz after the communism fall down in Poland. Former table “here were killed 4 million people” - was simply changed “were killed 1,2 millions”.
Those fact just confirmed the doubts of the deniers.
This is very normal to be the sceptic it simular cases.
But what is strange those denier become “out of law”. Some state get the anty-deniers lows, which practically make equal the doubt in official figures of Holocaus and Nazi propoganda.
Cheers.