In principle I do not believe in laws which entail censorship. I believe in free speech and, moreover, I don't think such laws are efficacious.
However, having said that, I also recognize that Germany and Austria are sovereign states with a democratic system. And, more importantly, they have a unique history which gives Holocaust denial a different resonance in their country than it might in the United States or the UK.
David Irving brought this down on himself. He knew there was a warrant for his arrest in Austria. Nonetheless, he went there -- after posting the fact that he was going on his website and having the students who invited him announce it on their website. He knew the law in that country and yet he flagrantly violated it. As my friend Ken Stern said: if you don't like Thai drug laws, don't go to Thailand.
In essence, when he sued me for libel he did the same thing. Daring me to defend myself (and assuming I would not), he took me into court. I fought and exposed his tissue of lies.Finally, when all is said and done the way to defeat these kinds of lies is with what I do in the classroom and what we did in the courtroom during my trial in the UK: With the historical facts, the evidence, the testimony. In short with the truth.