On what occasion did Mel Gibson deny the Holocaust?
He advocated his Father's Holocaust denial. This was quite awhile ago, and many people let go his little equivocation and dropped it; he was making too much money for all the right people in Hollywood - and nobody wanted to dig too deep.
In light of his “The Jews are responsible for starting all the wars in the world” rant, his Holocaust denial and the abject lunacy behind his worldview comes more clearly into focus.