It's interesting talking in person with a Holocaust denier.

They start out by explaining there is no evidence of the Holocaust, and in fact the Nazis killed few Jews.

So you ask them why this idea is so widely believed, and they explain it is because the Jews have a vast conspiracy to mislead the world so as to gain favor for themselves and the state of Israel.

So you ask them, "Have the Jews done anything else bad?" and their eyes light up, and they go into an long rant about one terrible thing after another the Jews have done, throughout the whole course of human history.

And by the end they have made the Jews look so bad that it would have been a simply wonderful thing for Hitler to try to kill them all off.