I don't know if I "deny" it, but the whole event is filled with contradictions and absurdities that I just don't know what to believe. There has also been a number of memoirs which have exposed to be a pack of lies decades later. Memoirs which Holocaust survivors themselves have praised with and even defended after the fact, which is pretty suspicious.

To make a comparison, there have been plenty of war memoirs which have turned out to be false or highly exaggerated to the point of being absurd, yet they get published. However, real veterans spot the holes and expose them quickly. You'd think survivors of genocide would spot someone was lying, especially if they claimed to have been at the same death camp.

One other thing I've always found suspicious was why they had to implement Holocaust denial laws around Europe after WWII. In some countries, even doubting the official figure is a criminal offence. Why? I mean if it's so obvious that it happened then the truth doesn't fear investigation.