Invent a folktale where the rule fails for a good reason

Write an original 700-word fictional folktale in [IMAGINED PLACE] about the village rule [RULE]. Introduce the rule through a daily practice, show one case where it helps, then a case where following it would cause avoidable harm. Let a character revise the rule publicly, with a cost and a workable replacement. Add a one-sentence moral that admits the tradeoff. Avoid borrowing a named culture's sacred story or claiming historical authenticity. Check that the revised rule handles both cases and the ending does not erase consequences.