They'd have to deny that their beliefs are flagrantly at odds with reality.
They'd have a hard time doing that.
( Newington HM Time Corps: Quo vadimus non requirimus vias, Mon 13 Oct 2008, 11:26, archived)

Fair point.

( Undulating Tentacles of Love it's voucher exchange festival time., Mon 13 Oct 2008, 11:27, archived)

On the contrary
They don't seem to have any difficulty denying that their beliefs are at odds with reality- the problem comes from getting them to admit it.
( The ghost of Lord Gnome past It couldn't happen here, Mon 13 Oct 2008, 11:49, archived)

I wasn't being sarcastic or anything.

( Newington HM Time Corps: Quo vadimus non requirimus vias, Mon 13 Oct 2008, 11:52, archived)