You're trying too hard to find a correlation here. You don't know these people, you don't know what they intended. You try to compile statistics and correlate them to a result that amounts to nothing more than speculation.
The prevailing legal and moral views of a time are held not only by those whom they benefit but by those, too, who appear to suffer from them. Their domination is expressed in that fact- that the people from whom they claim sacrifice accept them.