I consider holocaust denial to be one of the most ridiculous acts of stupidity since the second world war - It is no worse than believing there's a magical reptilian governing the world. But one can be a Holocaust denier and still make one or two points that are correct about other topic. The fact someone gets the easier wrong doesn't follow that the harder will be as well. I remember doing this exam where I was able to answer all hard questions but then I couldn't answer the first, most basic and simple one.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you