Sean Gabb has written a fine piece called Defending the right to deny the Holocaust, stating why censorship undermines our ability to decide what is and is not true.
With regard to the holocaust, I have – broadly speaking – two options. I can believe that it did happen roughly as claimed. Or I can believe that it is a gigantic conspiracy of lies maintained since the 1940s in the face of all evidence. Since debate remains free in the English-speaking world, it should be obvious what I am to believe. I believe in the central fact of the holocaust. On the secondary issues mentioned above, where my authorities do not agree, I suspend judgement.
Take away the freedom to argue with or against these authorities, though, and my assurance that they are right must be weakened.
Read the whole thing.