Gas chambers is another. We see this on alt.revisionism and talk.politics.mideast - in fact, any place where they show up. It is not their intention to arrive at the facts. It is their intention to hold their position despite the facts. They have taken a patently absurd position.
Lets look at the methods used.
Every few days they come back to the beginning - by repeating the ridiculous story that started it. Stubborn is being met with stubborn. You will also find the Yiddish insults of drinking too much wine being the reason. There is a lot more I could go into. Everything they are doing has direct parallels in Yiddish literature.