There are plenty of other stereotypical white planets. I was watching another season 1 episode where Wesley breaks some white people greenhouse and is sentenced to death. And why are stereotypical africans definitively bad? Do you think that African culture would not be able to achieve sophisticated technology and interstellar travel unless they were guided by a European-esque culture? Star Trek has never equated technological advancement with moral advancement. Klingon, Ferengi and even Federation culture is depicted as racist, misogynist throughout the run of the show.