upon learning the truth you are not able to challenge the Paladins about it, there is no discussion to be had because no dialogue options show. I don't know if this is a bug or an oversight or plain bad writing but you really should have the option to discuss your findings and challenge them about their folly.
I felt like they were fanatical in their belief and that there was no bargaining.... either you are with them or against them... period... end of story.... do not pass go, do not collect 200 gold.