I think it would be more traumatic to find out you were wrong if you were one of those people who so firmly believe that their way is the only way and everyone else is damned. I think under those circumstances, finding out you were wrong would pretty much shake your worldview in a huge way.
Personally, I'd probably go,'They were the only people who got it right? Ok then, colour me - insert faith here - then.' You'd have to be a nitwit to deny you had it wrong when you were faced with the ultimate proof.