So "magical thinking" explains why they believe this stuff in the first place, but what explains why they keep believing it after it doesn't work? Even in a fantasy setting, it doesn't make sense. If you thought vampires couldn't come into your house uninvited but then a vampire did exactly that, you'd run away. These people would lecture the vampire about what his weaknesses really were and then go online and complain that the vampire sucked their blood when he wasn't supposed to.