I agree with the fact that fiction isn't prophetic, but it can definitely be a societal-wide warning shot. On a personal level, it's not that far-fetched to read a piece of fiction that challenges one's perception on many levels, and as a result changes the behavior of the person itself.

Fiction should not be trivialized and shun because it's fiction, and should be judged by its contents and message. To paraphrase a video game quote from Metaphor; Re-Fantazio: "Fantasy is not just fiction".