Well, there's redheaded Nordic aliens and they're high on STS hierarchy. If we consider that aliens have seeded us and have tinkered with our genetics, it might be possible these redheaded Nordics have passed their genetic material to us. Of course, red hair itself probably doesn't have much effect on our bodies, but it makes you think - what sort of effect do these genes have on us, especially on those who manifest the genetics for redheadness?
Anyways, I cannot quite come up with any esoteric explanation or such apart of this, though I've read that ruling classes (pharaohs) were redheaded - and what about Brahmins and other descendants of Atlantean survivors?