Shark attacks near Perth are genuinely rare - fatal ones even more so - but the risk isn't zero, which is why the incident you're referring to stands out so sharply in people's minds. Over any given year, the chances of being attacked while swimming are extremely low, though Perth's waters do have more shark activity than some other Australian beaches because of the geography and water conditions. Most swimmers go their whole lives without incident, but it's worth checking local beach reports before you swim, avoiding dawn and dusk when sharks feed, and staying in patrolled areas where lifeguards can spot danger. The fear tends to be bigger than the actual statistical risk, but that doesn't mean it's irrational to take basic precautions or to feel uneasy after a fatal attack - it's just that isolated tragedies can feel more common than they really are.