As I have said many times, I generally prefer settings where orcs have varied cultures and varied individual personalities (I tend to like my orcs warlike, but usually that is just a culturally feature shared due to history more than anything else). That said, I think it is unfair to say people just want to kill stuff because they look different. What people want essentially two things here (and sometimes they cross over). One they want to blow off steam killing monsters, and orcs are great monsters. Basically they want something like Gauntlet. I don't think there is anything nefarious about that, as it is a game and a fantasy setting. The other thing they want is they want a world populated with sinister and savage beings like orcs. The more you strip that out of a setting, the more it loses a lot of that sword and sorcery atmosphere. So while I usually do have more varied orcs in my own campaigns, I totally understand why a lot of people like the evil orc trope, I like it myself on occasion, and I don't think it really reflects anything about their real world morality