Consider racefail09, where sophisticated people with great skill in expressing themselves and intimate knowledge of our politics

Not at all. The people who complained about supposed racism in the original post should have been trolled hard for disputing the author's motives in wishing to write fiction about minority folks--and seeking to do it "right", i.e. minimizing outgroup biases. Their original arguments were non-sensical and should have been exposed as such. Instead what we got from the folks on the author's side was lots and lots of arguments about how minority people should have no say in the matter, and how pseudonymous/anonymous critics should be disregarded for not making their identity known (even though unprivileged critics have lots of reasons for being pseudonymous). The complainers' faction replied by correctly accusing the authors' side of racist bias, and that was that. It could no longer be sensibly argued that the OP authors were in the right when seeking to write about cultural outgroups in an unbiased way, so the debate was effectively lost.

Hardly a marker of "sophisticated people with great skill in expressing themselves and intimate knowledge of our politics".