Best post so far!

In fact, why would I want to call someone Nigger?
a) because that word derived from "negro" just meaning "black", describing the most obvious attribute and I don't know about the historical background.
b) I know well about that background and I use the word to offend someone.

If a), then how can I be blamed?
If b), then the intended goal is only achieved when the addressed person actual lets himself be offended.

To make this clear: I would never use this word, as I wouldn't address people using words like as*hole, ****, etc and I do not see any valid use for them.

Whenever someone I don't know uses them on me, I just think to myself "what a sad, pathetic person" and just ignore it. Why should I give a **** about insults by someone I do not care about?
So, I think the question here is: Why do black people make such a big deal about this and thus actually help racists?
I believe the reason is, that some feel better when they can seperate themselves from "white people" thus strengthening the bonds to other blacks*.
And I can see how this can be seen as racist...

*I'm referring to a sub group here, often calling themselves "gangstas", "gettho-kids" or such, not generalizing.