A rare Qur’anic account does not primarily satisfy curiosity. Moral recognition and reflection emerge when a narrated event yields a sound lesson relevant to human conduct. The episode of Moses and al-Khiḍr especially highlights restraint in judgment, the etiquette of learning, and limits on apprehending divine wisdom.
Narrative detail and the principle derived from it occupy different levels. The former must be established by the text; the latter must be a disciplined inference from its dependable meaning.
Human knowledge is limited—that is a general lesson. Claiming certain knowledge of the unseen reason behind a specific present-day calamity is not established by that lesson.