Sharks don't usually eat humans. We're too big for proper prey.
The sharks attack usually surfers, because their sense of electrical current detects movement in the water from quite a distance and surfers paddling on their boards look to that sense like a wounded fish.
Other reason is he stupidity of tourists and business owners. To attract the first ones, the latter ones throw bloody meat (which the shark can smell from a distance - it can discern one drop of blood from about 1000 litres of seawater) and the shark enter feeding frenzy, in which they bite even their own kin.
Shark attacks are one of the rarest natural attacks on humans. Only big sharks usually manage to kill, rather than maim, a human sized creature. The problem is, most people know only the sharks from movies like Jaws.
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"Listen to me, nugget, and listen good. Don't go poppin' your head out like that, unless you want it shot off. And if you do get it shot off, make sure you're dead, because if you ain't, guess who's gotta drag your sorry ass off the field? Were short on everything, so the only painkiller I have comes in 9mm doses. Now get the hell out of my foxhole!" - an unknown medic somewhere, 2013.
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