 What is a likely reason that the narrator chooses to go with what the citizens of Dondromogon believe about him?
He was Yandro, the Stranger of the Prophecy—and he found that he was destined to fight both sides. It is as well, for this will be a birth and beginning of your destined leadership on Dondromogon." The voice was telling me that I had been snatched from worlds away, for a specified purpose here on whatever windswept planet Dondromogon might be. Dondromogon was found and settled long ago, by adventurers from afar. Especially as I don't know who I am, or where I'm from, or anything that has happened longer ago than just a moment. "I am a scientist," offered Doriza, and came forward.
 He does not remember anything, is confused, and cannot back himself up on who he truly is.
 He thinks that going with what the citizens of Dondromogon believe will be his key to escape.  The people of Dondromogon are harmless, so he perceives no danger in remaining on the planet.  He does not remember anything, is confused, and cannot back himself up on who he truly is.  He figures that he will eventually be returned to Earth just as mysteriously as he left.