Thread:User talk:CodeCat/politically correct as a politically correct term/reply

I can see your point. If this were a topical category, that would make perfect sense, but topical categories link terms about something, while this kind of category links terms that are something. It would be like adding nominal to Category:English nouns (assuming, for the moment, that there weren't a separate noun sense): yes, nominal is about nouns, but it's an adjective.