I think you are right on this one. It seems to be like discussing religion - no matter how many FACTS you provide, most religious people are totally unwilling to change their way of thinking, because that is how they were taught, and it HAS to be right.
Did you know that in the 1980's Japanese schoolbooks still taught that the reason we did not use Atomic bombs on the Germans was that they were white, and we reserved them for the Japanese because we felt that they were sub-human? I actually had this conversation with a Japanese student in 1982. I provided PROOF that the Germans had surrendered in May of 1945, and that we didn't even test the first A-bomb until August 1'st. However he stuck to his beliefs, because that was what he was taught.
Excellent example of the power of worldview presuppositions.