How much impact would seeing a starship really
have? So the natives worship the image and idea of this thing
rising out of the ocean...so what? It's going to be twisted and misremembered for ages afterward. Rather than picking some deity out of their own imagination, they're going to make up a cult around something that only a few natives glimpsed for a few seconds. And this glimpse is going to negatively impact their culture how
? In a few thousands years the Nibiru natives will have "Ancient Alien" television shows that only a few take seriously, whereas some fanatic natives will insist that everything on their planet is the result of alien interference and/or assistance. Is that so bad?