system
A chat on subreddit /r/NoStupidQuestions
human
Conquest and enslavement was not seen through a modern day lens of morality. These people didn't think what they were doing was evil, because in their frame of reference, their acts were not evil. 

You can't impose modern day viewpoints on historical figures.
gpt
&gt;These people didn't think what they were doing was evil

No one thinks what they're doing is evil lol. Hitler didn't wake up, eat his evil evil cereal, and think "How can I be a villian today". He's not Robbie Rotten.