Explain please, Dr. Arliss, I'm all ears. I'm sure you have a very different perspective on this than I do, and I'd like to hear it. I don't know what your ethnic background is, but if you identify yourself as black, part black, or even just non-caucasian, it would be very interesting to hear what you think about the subject.
I grew up in a family and in an area that was incredibly racist, and have tried my whole life to "deprogram" what I was taught as a child. Maybe that's why I have strong feelings on this particular subject. My feeling is that when you perpetuate a stereotype which has its roots in slavery (which someone else pointed out), you also perpetuate the racism that goes along with those stereotypes. Whether we like it or not, racism is alive and well in the US. If you think that writing about it makes me a racist, so be it. That doesn't mean we can't have a dialogue about it.
My caveat was that this type of play, like other fetishes, is a way to explore things that are taboo. In that way, it could be liberating for the people involved, or just not affect the other portions of their lives. I just don't know. This isn't something I participate in.