They're not supposed to be black, white, or anything. They're supposed to be aliens. The differences in color within one village where everyone is presumably related to each other could be explained by the fact that alien DNA (and the genes that code for skin color) work differently in aliens than they do in humans. Why assume it works the same? These are critters more alien to us than a pine tree.
Maybe you can fault them for not disguising the fact that they were played by human actors better. I was disappointed at all the boring humanoid aliens. Would it have killed them to come across a planetful of Hortas every now and then? (And if some Hortas were different shades than others, I suppose we could complain about that.)
But if you wanna bitch about political correctness, the scripts were far worse offenders. "Starfleet captain flies in, lectures Obviously Wrongheaded Aliens about their obvious wrongheadeness, flies away." That schitck got OLD.
Maybe you can fault them for not disguising the fact that they were played by human actors better. I was disappointed at all the boring humanoid aliens. Would it have killed them to come across a planetful of Hortas every now and then? (And if some Hortas were different shades than others, I suppose we could complain about that.)
But if you wanna bitch about political correctness, the scripts were far worse offenders. "Starfleet captain flies in, lectures Obviously Wrongheaded Aliens about their obvious wrongheadeness, flies away." That schitck got OLD.