When you are controling the local population by ressurecting various satanic cults from ages past that you have researched at the linguistics and folklore university that you completely dominate you have to have a reason why people dont have to temper their titilation with fear when they watch human sacrifice.
Human sacrifice never happens to members of the core group. It only happens to niggers. In this case a nigger is anyone who refused or failed initiation into the core group or anyone who was not invited into the core group for any defined reason.
The reason the japanese girls were not returned to their families after WWII was given as thus "they have become christians" and though many of their parents were also christians, they said its not the same christianity. Some of the parents were persistant and capable of aproaching thier daughters once they reached majority and every single one of them had been sexually abused. So they became the kind of christian that includes sexual abuse of adopted children of other races, which is different to what their parents practiced, clearly.
They were mainly the lighter girls with more caucasiod features as well. But they failed to be incorperated. They either failed initiation, or past initially but resisted later.
Some people have different kinds of memory, and so resist ritual initiation by hacks. They can be contitioned but they require years of one on one instruction and a dedicated staff to cause this. People who can have their minds formated in a brief ceremony have some minor advantage or an increase in some petty skill, but people contidioned over years by skilled individuals have a level that surpasses anything they can do short of crushing someone under the weight of their sheer numbers, and frankly no one has ever seen that happen, so we may have you beat in that too.