It often amazes me what strong reality-deflector shields some people have. One, when someone was decrying the evils of gay adoption, I asked whether she knew of the studies that directly contradicted her assertions. She responded that yes, she did. No "but," no "therefore," not even a token attempt to dismiss the studies' credibility — she acknowledged the reality but chose to believe the exact opposite anyway.
I wish I could believe that such a person was an isolated exception, but I have no reason to believe that. Many people have a much stronger need to believe than to know, and their beliefs can withstand any amount of evidence or logic. All one can do is to present one's arguments so that at least third parties will see who has an argument and who simply believes with perfect faith in belief with perfect faith.