Killer whales have killed multiple humans while in captivity, so why do we still keep them in tanks?

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Synopsis | Natural Born Killers (2010)
They seem like the friendliest and most sociable of creatures. At least, that's the impression you get when you watch killer whales swimming in wildlife documentaries or performing at marine parks. But don't be fooled, these are wild animals; predators at the very top of the food chain. They are, as their name implies, killers. None more so than Tilikum, an orca at Florida's Sea World. He's killed three times. Two of his victims were his trainers and his tragic story makes you wonder what we're doing confining these majestic and clearly very dangerous creatures in concrete tanks.

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