C'mon.
Yeah, it was amoral and evil. No it's not a contest.
But, as the post that started this particular conversation went:
What do you think?
Does the the Barbary slave trade and the existence of white slaves in the past make things "even" with the African-American slave trade? Does the fact Arabs took Irish and European slaves mean that it's okay to have the only people of colour in a film be villains?
The Drow aren't "black" in the racial sense, they happen to have black skin. And who says all the heroes have to be white? They don't. This isn't a white vs black thing, let's not make it that way people and confuse a fantasy race with real world racial politics that it doesn't make sense to apply it too.