Yes. Quite aside from the moral issue (denying the Holocaust amounts to bearing false witness against 16 million people), a blanket excommunication of all Holocaust deniers would send a message that the Vatican will not countenance the perversion of history by its members. This would have the not-incidental benefit of sending a message to the leaders of the Middle-east as well.
What about non-Catholics? What would happen to them?
Non-Catholics are obviously out of the Pope's chain-of-command, and therefore not his responsibility.
Shalom.
I’ve got a hard time agreeing that the deniers should have religious sanctions against them.
What about those who think that 9/11 was staged?
What about those who think the world is flat.
What about those who think the sun revolves around the earth?
And those who don’t believe in the Armenian genocide?
Should they be excommunicated?