If orcs/goblins were deleted as the generic bad guys from something like Lost Mine of Phandelver, and gnolls were dropped in instead, would people still have the same moral objections?
Right now, gnolls are basically demons. Personally, I dislike that since I like gnolls a lot (also, because they're still listed as humanoids--or at least were; I don't have MPMM to know if they've been updated).
But, since they're made by corrupting a natural creature with demonic influence--meaning they don't have a true society or familial feelings, then I for one have much less of a problem with them being the generic bad guys. I just wish it weren't gnolls because I like 'em. I would prefer a "corrupted creature" template, like in 3e.
Orcs (and goblins and other mammalian humanoids and at some non-mammalian ones) are born in D&D; they're not corrupted elves or anything like that. Since they aren't precocial and need to be cared for by their parents, that means that orcs would have to have family ties. Since they remain together after maturing, they also have social ties. Orcs would
have to care for each other for their society and biology to make any sort of sense. Gnolls are not born, they're created, and they don't have a society so much as they have a truly mindless pack, not even a pack like real animals do.
One
could put bullywugs into this category. Some frogs and toads care for their young; others don't. It's entirely possible to have it so that bullywugs don't care for their young and don't form societies upon reaching adulthood but are still smart enough to figure out how to make weapons (even if "just" stone-tipped spears), nets, and other such objects all on their own. On the other hand, as I said, some batrachians
do care for their young--we all know about the famous midwife toad, where the male takes care of the young, and they're not the only type who do--so having them form caring groups is also completely logical.
Perhaps ironically, the good-aligned tortles should be among the
least social of the humanoids, as AFAICT, actual tortoises don't care for their young at all.