>>17881296There's more to it. For a period of time, apparently, burning children was not enough to appease Remphan/Moloch/Baal. There are historical records indicating that mothers would have some kind of ritualized sexual intercourse with their sons.
300+ people is actually just barely enough to avoid genetic damage from inbreeding. This is usually quoted as the excuse for it, among Ashkenazis. The genetic damage came from something else.