You can't use logic to talk someone out of a position they didn't use logic to decide on in the first place.
Those kinds of people should get nothing but scorn from the rest of us. No conversation, no attempting to change their minds.
Just pure, unadulterated scorn and derision. Nothing else. Fucking morons aren't useful for anything other than diluting the gene pool anyway.
Then let them. What does it matter to you? People are allowed to be complete morons if they wish.