why does the impaling enchantment a useless enchantment do more damage to mobs touching water in bedrock edition explain me why

the impaling on bedrock; the impaling on java; i am you but better who does more damage to any mobs touching water and can spam click and can even do it in rain so if a raid in a rain you are toast and i am ranged and do as much as a netherite sword; i can only do more damage to aquatic mobs but not annoying drowneds