Humane treatment for killer whales?

If you attach a large dog to a chain and feed him raw meat, tease him and not let him go year after year it will become vicious. If you place a man in a small jail cell day after day and year after year and not let him go he will no longer value anyone’s life including his own. If you place a killer whale in small confines like Sea World day after day and year after year it is likely to develop resentful behavior characteristics in which the killer whale lashes out by killing its trainer. Perhaps a better solution would be for Sea World to allow killer whales to access to the sea and train them to come back to do their shows. It would be the ultimate and humane treatment challenge for Sea World.