Most likely a hoax, of all in the events in history why is it the only one to be illegal to question? That right there makes you wonder, any other atrocity like the Russian revolution or Ukrainian holomodor not one fuck is given if someone questions those events but when the holohoax gets investigation on whether it truly happened or not, all of a sudden you'll have criminal like behavior as if they have something to cover up or sweep under the rug with no questions asked. I can see the deprived actions of people who defend this event as real, if it did actually happen everyone would be able to tell the differences and effects it would have if such occurred without any foul play involved.