To put it into terms that are less dividing (religion does that), here is a scenario that happened a few years ago. The US invades Iraq.
The Iraqi Information Minister is famously quoted as saying "There are no American infidels in Baghdad. Never!", despite at the time the incredible overwhelming proof that there was. Photo and Video footage is pretty conclusive evidence suggesting that there was.
You just can't change some people thoughts on subjects, they will believe what they want to believe... like Bishop Bernard Fellay (he's a holocaust denier) who's excommunication from the church was recently rescinded.
Fellay can believe in a man rising from the dead nearly 2000 years ago, but has trouble believing the Nazi's did some mean stuff only 60 years ago*
*joke shamelessly stolen from Stephen Colbert.