"What's the designer saying? That sentient creatures can be evil just because of their culture or how they look? Is any given orc evil because of what it does or simply because it's an orc? [...] See, if you say it's fine to kill orcs purely on the basis that they're orcs, how can you argue with anyone who wants to kill Arabs, Afghans, or Americans purely on the basis that they're Arabs, Afghans, or Americans?"
— Richard A. Bartle, MMOs From the Inside Out (info)