Why aren't you angry?

I read an article/interview with M. Night Shyamalan about The Last Airbender and then I read comments on ONTD (because I hate myself apparently) and it just makes me so upset. I understand why soem people don't care (even though they should) but I just get so mad when I read the justifications. People actually defend the casting because "movies have to appeal to lots of different people." And that doesn't make them angry. Why aren't they mad that Hollywood is saying that we white people can't identify with people who aren't white? It makes me furious and insulted but they seem to think this is perfectly okay.

I also watched the finale of Doctor Who. ( spoilers live under the cut )