There was a basic conflict of interest between host child and Transmigrant. So the Transmigrants reduced the Receptacle class to a condition of virtual idiocy. Otherwise they would have reneged on a bargain from which they stood to gain nothing but death. The books are flagrant falsifications. And some of these basic lies are still current.
Nothing is true.
Everything is permitted. The last words of Hassan i Sabbah, Old Man of the Mountain. It is said that an initiate who wishes to know the answer to any question need only repeat these words as he falls asleep and the answer will come in a dream. This is the open city of contending partisans where advantage shifts from moment to moment in a desperate biological war. Here everything is as true as you think it is and everything you can get away with is permitted.