Sharks are your friends :-)!
"b-but they kill people!"
Well, one, that's a flawed view of an statistic that's not nearly as common as you'd think; two, that's a common phenomena spread worldwide by the 70's movie Jaws which kick-started every other monster shark movie, completing the shark fearmongering cycle of hell.
Three! They keep nature balanced by being a predator and like any fucking predator, they're important for population control. Being an apex predator/at the top of the food chain in most ecosystems makes them key to controlling a lot of predator species, even, giving they can occupy tons of places in a food chain/web at once. So if you extinguish a shark species, you guessed it! You've done it fucked up! Natures gonna go fucking bonkers! Fuck you!