Is there a line though? I feel like owning human beings and treating them with tremendous cruelty cannot be excused regardless of cultural environment, because we have inborn intuitions that strongly tell us certain things are wrong that can be listened to, that cross cultural boundaries and time. Lots of other things that I wouldn't excuse someone in my own culture for though, I would be more willing to excuse of someone in a different culture/time, because otherwise I'd be basically demanding that no other cultures exist.