No, it's not, because with the greatest respect you're not the enlightening sage you think you are.
Change. It happens, deal with it. Nothing lasts forever. Didn't you learn that when you left behind the JWs.
Why does it matter what colour people are on any given piece of land, it's irrelevant. We're all human and it's the diversity of ideas that makes the world interesting, not the spread of pigmentation.
If it makes you feel any better, after a few generations here, the darker people's descendants will gradually become whiter anyway, as an adaption to the lack of sunlight. Unless of course everyone starts taking vitamin D supplements, but that's just progress I suppose.
Try and look past people's skin, seriously.