Which one of those links are meant to be representative of society as a whole? There is some Stretch Armstrong level stretching going here.
If you don't want Dark Sun to come back, that's cool. (I honestly have no dog in this fight, beyond sticking up for logic and reason.) But there's no obstacle to bringing it back, especially since WotC has shown no hesitation about changing things they feel ought to be changed. But "oh no, the bad guys are demonstrably bad by their actions, not their ethnicity," is not a compelling argument.