The cost of speech

The conviction of David Irving for the crime of "holocaust denial" reminds us that our opinions are not without cost.
It is well to note that this is an issue about freedom of speech, but freedom does not mean that one should be allowed to avoid the consequences of our words. Irving's long time protestations ...including that there were no gas chambers in Auschwitz, and that 6 million Jews were not killed....sound uncomfortably like propaganda and deeply offensive trash.
Lest we forget that this is also closer to home than we think...look at the website of the so-called Adelaide Institute which tells us that the sorts of facilities at Auschwitz included

cinema, swimming pool, hospital, library and post office.

Why does such garbage still exist? Who is interested in propagating such idiocy and obvious untruth?
To develop the idea oft quoted of Voltaire: I may disagree with what you say, but I defend to the death your right to say it....but I would want to add...I also require that you like I should accept the consequences and not hide behind claims of an absolute right