Topic on Forum:Trope Talk
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Well, it can have a legitimate use, as a story in which only white humans are depicted when there is no cultural or plot based reason why they had to limit the options to just humans of peach toned or lighter skin can be valid. It can also explain the logic behind how the trope is cited as 'true' in racist fiction like The Turner Diaries.
It would definitely be a subtrope of Creator Provincialism, though, but it's not necessarily bad in terms of name if you ask me, but it's purpose could be made more explicit.