This brings up a mystery. There is a long-standing myth about blondes being so dumb. Then, why don't more of them become Jehovah's Witlesses? When I was in the territory, most if not all blondes refused the message while brunettes tended to be more receptive to it.
Also, most of the blondes in the congregation were raised in it. They did not have any choice. And, when they grew up, a high percentage of them turned apostate. Of the ones that didn't, a very high percentage of them had too strong family ties that stopped them from severing all ties with the Watchtower Society. Very few were actually in there, volitionally, and remained there volitionally.
And that allows for those that fell for the scam despite being very intelligent because they didn't have access to all the facts. True, a small percentage of blondes are really dumb (and that can be said for everyone). But, if the dumb blonde myth were true, I would expect more of them to come into the Tower even with today's technology that brings all the facts to one at the touch of a mouse button. As far as that goes, that is one more nail in the coffin of that myth.