It doesn't mean, necessarily that Rh- isn't associated with intelligence. Depending on other factors a very intelligent person can be vulnerable to toxic exposures that cause brain damage. DPT vaccines were associated with grave damage to many children and were the supposed reason that pharmaceutical companies were granted "immunity" (irony noted) from civil liability for vaccine damage.
"Child Protective Services" is legalized child trafficking. Lawyers can be trained to recognize the consequences to traumatized victims and their families.
http://medicalkidnap.com/2019/06/23/american-bar-association-training-for-attorneys-trauma-caused-by-separation-of-children-from-parents-worse-than-staying-in-troubled-homes/