Why do people still belive in the Holocaust?

The main reason for why most people believe in the Holocaust is that they want to believe it. It is a form of “group thinking” which bonds them with so many others–--and totally liberates them from any guilt feelings for their own moral depravity and heinous crimes.

The Anglo-American mass incineration of countless innocent women and children mean nothing if the other side did worse things. The facts are that even if the holocaust were true, the crimes committed by the Allies, especially the US, are far worse than anything the Nazis are even accused of committing.

Why do people continue to espouse forensically refuted lies even after being confronted with the incontrovertible facts that refute them?

Because you can’t convince a true-believer of anything - for their beliefs are not based on science and reason - they’re based on blind faith and a weak-willed NEED to believe. Hence, most propaganda is not designed to fool critical thinkers - but rather; Only to give self-deceiving cowards an excuse not to think at all.

Cognitive dissonance theory explains human behavior by positing that people have a bias to seek consonance between their expectations and reality. According to Festinger, people engage in a process he termed "dissonance reduction", which can be achieved in one of three ways: lowering the importance of one of the discordant factors, adding consonant elements, or changing one of the dissonant factors. This bias sheds light on otherwise puzzling, irrational, and even destructive behavior, such as belief in fairy tales.