Well, we have already explained it, but I’ll try one more time. The language used to dehumanize and vilify [insert evil fantasy race here] is the same as the language that has been (and still very much is) used to dehumanize and vilify real-world peoples. Including it makes the game less welcoming to people who have faced and do face discrimination on similar grounds. One doesn’t have to think that orcs are meant to be representative of one’s own ethnicity to be made uncomfortable by the fact that, in the make-believe game people are playing for fun, they like to pretend there’s this group of monsters that it’s ok to kill, for exactly the same reasons people have used to justify killing people like you in real life. Orcs don’t have to represent black people for people to be kinda put off by the fact that some folks get their kicks by imagining there’s this primitive humanoid subspecies who’s inherently violent and needs to be put down, and imagining themeselves as the ones doing the genocide.