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As of right now there's just Category:Works about disasters and Category:Apocalyptic fiction & Category:Post-apocalyptic fiction, however not all creative works describing (or issuing) a societal collapse (as well as its causes, management, impact etc.) are of the post-/apocalyptic kind (a societal collapse does not imply the end of humans, Earth or alike) and not all works portraying disasters feature a societal collapse ("Works about disasters" would be a super-ordinary category on this category).
So what do you think of this category? (It could also be called "Societal breakdowns in fiction" or alike.)