Damning the Deniers
The Pedant: How to avoid being in denial - Times Online
...Holocaust denial is a distinctively mendacious proposition. But “denial” is rightly applied in other cases where there is no legitimate debate about facts. Deniers are those who refuse to accept the evidence.
Denial is not a synonym for heterodoxy. Because some claims fall outside the bounds of genuine debate, it is a valuable term for distinguishing among minority positions and an apt label for the claims of pseudoscience and pseudohistory. To reject the evidence that Aids is a medical condition caused by a virus is that type of position. So is rejection of the evidence of global warming caused by human activities. These claims have costs, in persuading people to reject evidence-based science. No other succinct term describes them as effectively as denial.