Why did jaws kill people?

Answer 1

Here is how the shark eats its victims in the movie "Jaws":

Victim: Chrissie. The shark in "Jaws" first eats Chrissie by attacking her from below as she goes out for a night swim. It drags her around in the water for a while as she screams before pulling her below the surface to finish her off.

Victim: Alex Kintner. The shark swims up from below and bites into the boy while he's floating on a raft. Alex struggles in the water as he's getting eaten, with lots of blood bubbling up around him. Screaming, he is pulled below the surface and evidently devoured off-camera. According to the book, he was crushed and bitten in half, with his legs falling away and spinning toward the sea floor.

Victim: Guy in rowboat in estuary. The shark bumps the boat the man is sitting in, capsizing the boat and knocking him into the water. The shark swims up from below and drags him underwater. He is then shown from a distance struggling and screaming on the surface before we see the shark partially out of the water with its jaws open, about to eat the guy. It bites down and clamps its jaws on his torso and pulls him down. Blood bubbles up to the surface, and his severed leg is shown drifting to the bottom of the estuary as he evidently gets eaten below the surface out of view of the camera.

Victim: Ben Gardner. His attack is not shown. Underwater, his head pops out of a hole in his boat (with an eye missing) when Hooper explores the seemingly abandoned boat.

Victim: Quint. At the end of the movie, the shark launches out of the water and crashes down onto the back of the boat occupied by Quint and Brody. The back end sinks, increasing the angle, and Quint slides down toward the shark. He kicks frantically at the shark, which is gnashing its jaws, trying to get him in its mouth. It finally succeeds and bites down on his legs initially with a gnarly crunch. Its teeth are then shown stabbed into his stomach. With Quint's lower body inside the shark's mouth, the shark thrashes the screaming, struggling Quint from side to side and bites down on him a couple more times, with loud crunches, crushing bones and flesh as it's eating him. The last bite is hard enough that it causes Quint to spit up blood. With Quint's now-lifeless body almost bitten in half, the shark drags him below the surface to presumably devour him. Ragged bits of his clothing, flesh, and sinew are visible in the shark's teeth as the beast menaces Brody for the remainder of the movie.

Answer 2

Sharks need to eat. They eat to live.