Good point but:
Freedom of choice yes, but no one has to go play near the water, that is their first choice. When they get there, they abide by the rules, if any, applied to that place.
Thinking of when a tradgedy happens, I feel for helpless witnesses and others who's lives will affected for ever; they have a right to be protected don't they? I wouldn't want anyone to exercise their right to walk under a bus just as I were nearby.