I don think killer whales should be keep in sea world because it is killing then and its not giving them the free world that they deserve. They are getting trained wrong and punshied for the stuff they do wrong like swimming in the wrong place.
The trainers at sea world are not even training the whales correctly so the wales are learning the wrong things in the wrong place because whales don´t belong in sea world.
The trainers at sea world are not doing it right so they are killing or even hurting the animals. The get mad and take it out on other whales that hurts them.
People may think that the whales have a nice life but they also think they dont get crazy kept inside, their behavior proves different when tilikum killed the three trainers. He was raged and upset he was taken from his family and put some where other than the ocean.