I immediately note that the rise of the so called "Enlightenment" scholars that dismissed Egypt as a source in the links of knowledge were the same people that gave us Johann Blumenbach and the dehumanizing of "black" people which gained a new tenet at that time - that africans descended from apes while europeans are the children of god.
Which would of course mean that all those slave-holding rapists were committing beastiality (by their own ethical system's rules).