@parenthetical classic fantasy storytelling doesn't really work without having something you don't have to feel bad about killing. (because classic fantasy storytelling is often racist.)
you say it's wrong to kill orcs? then soon you will witness the introduction of Tribal Undead or Lesser Elementals or Giant Insects or somesuch....
@parenthetical probably structured in a way that it's always extra super okay to kill them you guys seriously now.
otherwise, your story has to grapple with a lot of challenging stuff like basic desert, the problems with colonial thinking, multicultural world building, and half a dozen other things that each individually create as much work for the author as telling the story they wanted to tell.
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