Take a story's temperature by studying its tone. Is it hopeful? Cynical? Snarky? Playful?
Doomed, Removed, Tranquil
We definitely get a sense of fatalism reading The Pearl. The narration declares with removed, pensive observation that all are greedy, that the pearl brings evil, that Kino has become an animal, etc. The mystical, dream-like quality of the setting complements this well: there is no urgency or concern here, since the tale is simply a parable being told by a story-teller.