Two words.

Public
Lake

That said, I suspect it's legal for me to shoot holes in my own dock with a pistol, repeatedly.

Game Wardens are scarce. Police are scarcer. Fish are everywhere; common sense is usually not. If turning the other cheek is not in your vocabulary, I 'spect you deserve whatever happens next, if you get yelled at by anyone on the water, a dock, a deck, a boat, or whatever. Start motor, smile, turn, leave, find new spot.

Course, I do agree that some folks are fair game to shoot at, like water bugs (skidoos) and tournament fishermen.