Seems like a redundant stupid sign? You’d be surprised how many people need to be told things that should be taken for granted.
“Brush your teeth”
“Get off the couch and go exercise”
“Don’t eat all that junk food, it will kill you”
“Don’t drink and drive”
“Don’t piss off the giant gorilla”

Common sense is not all that common. We innately know the things we are supposed to do in our life and yet we stubbornly ignore them. Is it laziness? Arrogance? Have we become to expect being told everything and we can’t think for ourselves anymore?
Time to take charge of your life…. Don’t drown!!!!