Somebody who, for whatever reason, does not believe into the official holocaust version, cannot be reached anymore in Germany by any official media - simply because he knows that these media cannot openly discuss this question.
Thus, not only those who have arguments against the official version cannot participate. But also those really interested in a public debate, because they have some doubts, cannot be reached. If you want to find out the truth, you simply cannot rely on public sources. This may not be relevant for many people - it is, last but not least, already history and has happened long ago. Moreover, for example I'm a libertarian anyway, and would not become a Nazi even if I would find out that the whole holocaust story was a hoax. This would, in fact, change nothing, because I'm sure anyway that the leading politicians of that time were villains, and Hitler himself has said quite openly and undisputed enough to qualify him as one of the worst of them.
But debates about holocaust are something I would simply not listen at all, because whatever is said there will not be questioned even if it is wrong.