The problem is that it isn't a language tradition, it's inherent in the nature of "darkness" (i.e. the absence of light) as a concept. When it's dark you can't see, it's night so it's cold and there could be predators etc.

If we're going to make a change to language then it should be to stop describing people as black or white. Which was never particularly accurate to begin with, since "black people" are really varying shades of brown and "white people" are varying shades of pink to light brown anyway.

I assume it's too much to ask that we stop categorizing people by "race" entirely.