Wanna hear the difference between their situations?
You insulted a religion of many users here.
They didn't insult anyone, I can't say its fair to keep the name since this is an international community, every country is different but as far as it goes in Canada (where we had a LOT of racism) we use the word in many places, literature, even in my university my professors say it because they prefer to think of the word as a positive meaning rather then negative.
I've yet to see anyone that's black claim racism, and again as I said, in real life in school, or even at work we call each-other nigger even though I'm not black and I have black friends but they don't mind. That being said I don't think you can relate the two, you talking ish about someone's god, and a guild being named NiggerS. If it was like F*NiggerS yea, that would be offensive but what if they're all black or some are black? They have every right to call themselves the term.