Save your breath. They'll continue voting Democrat no matter what.
The interesting thing about the whole subject of Holocaust Denial is that a lot gets denied even involving the last Holocaust and if its the right people doing the denying its no problem. Like the whole question of denying Jews entry to the USA in the 1930s. Who did that? Conservative Republicans? Who was president in 1938 when the door was slammed shut? Herbert Hoover? Yeah, let's talk about Holocaust Denial and how stupid the Jews continue to be on the subject of who are their real friends and who are their real enemies.