If you go back in American history, you quickly run into at-scale activities which are now viewed as evil, or painfully decisive - wiping out the natives, mass

If you go back in American history, you quickly run into at-scale activities which are now viewed as evil, or painfully decisive - wiping out the natives, mass importation of slaves, etc. People generally read fantasy to escape the miseries of their current-day worlds. I'd assume that fantasy authors understand this. And pretty-much know how not to become a lightning rod.