Pretty sure I never called them evil societies even once (Feel free to find a quote where I said so) It´s you the only one that said that I do.
I always said that they condone behaviours that are considered evil in most societies in modern times. Those societies are the product of their times like our societies are the product of the era we are living in.
And there are plenty of historical recounts and archaeological findings that prove the existence of State-condoned human sacrifices, ritual cannibalism, slavery and many more practices that are considered taboo in modern times.
That said, apply modern morals to a fantasy medieval word is pointless. I expect people in Faerun behave more like renaissance people and less than Modern millennials or car salesman, for example.
