If there was lions around I'd apply the same logic and not go outside. Sometimes survival is very simple.
The logic is literally the same, you stay on land so you don't get eaten by a shark, but the chances of running into a lion on land are much higher than running into a a shark in the sea.
That's just because people tend to be in them....the fact is if I don't go swimming where sharks live I cannot be eaten by one. It's a very basic level of intelligence I've employed! Same goes with parachuting, rock climbing and any kind of stupid **** like that. It's very simple.... always reduce your chances of a gruesome death.