It's slightly less predictable than a river that has been too polluted to swim in for half a millennium.The French are pigheaded. But what would you do if a Cape Town Olympics was under threat 'cos of a shark scare Atlantic-side, send everyone off to Muizenberg? No, you'd let a few sharks get their meal and save the rest.
/runs
But on that point I've actually been semi-involved in the organizing of an open water swimming event in very sharky waters. (Plett) Drones, shark spotters,kayak escorts and a a slightly altered course was the solution. You don't have to get too drastic.