This is why, in the face of overwhelming evidence, they will come back the next day with the same position as though the overwhelming evidence had not been presented. If the challenger gives up, they count that as a victory. All they did was hold out longer. The ones honored in their stories are those who manage to hold an impossible position all their lives. The attack on the Liberty is one.
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.