In the novel Footfall, by Larry Niven and Jerry Pournelle, unfriendly aliens attack the Earth, and science fiction writers are asked to join scientists to provide some insight into alien behavior and technology.
Ideally there would be a wide range of skills and philosophies represented on such a committee, since, let's face it, no one on Earth has direct experience in first contact with extraterrestrials. It's a common trope in science fiction that only SF authors (or avid SF readers) can fully understand what's happening when an extraterrestrial or time traveler arrives.
There is clearly wish fulfillment involved in that assertion, that I'm not immune to myself. I read and watch lots of SF, and I think I would do an excellent job advising the UN on how to treat with aliens. I would do at least as good a job as most politicians anyway.
That said, I do think there are some SF writers who would bring special skills to the table in the case of an alien arrival. Go read the whole Mind Meld to see who I and the other participants suggested.