If the entire aristocracy is of divine descent, Zeus (or El) cannot save the human son without upsetting the order of things.... Hera reminds Zeus that many sons of gods are fighting around Troy, and that if Zeus spares his son, other gods will do the same for their sons, so that the earthly system will cease (Iliad 16: 445-449)

Ch.VII Further Observations on Homer - The Common Background of Greek and Hebrew Civilizations (1965 [1962])