Honestly I think that Mystara may be the answer to the modern morale conundrum of RPGS.
It uses a idea core to Warhammer 40K success, that there are no good guys. That there are just the polilitics and philisophies of a weird bunch of historical analogies. Good races and Evil races was always a dumb RPG trope and are very much core to post Tolkien fantasy. The evil race/nation thing always bothered me about Forgotten Realms.
The two global super powers of the Mystaran setting Thyatis and Alphatia are both pretty awful exploitative empires. And even the Immortals manipulating the conflict at the heart of the Wrath of the immortals are not Good/Evil. I think that fantasy emergent from the setting can be explored in a sensative and fun way. Not by arguing for cultutural relativism but by asking players what theyre happy about exploring.
The Isle of Dread( A core mystaran experience) which has a free 5e version knocking around from the 5E D&D Next playtest, could be run incredibly insensitively with racist and colonial tropes. Or it could be played without the bigotry and instead with understanding and treated as a first cultural contact( psuedo europeans meeting psuedo south sea islanders).