That's Why They Are Called Killer Whales

Shamu "attacked" his (her?) trainer during a show at SeaWorld.  Shamu grabbed the trainer's foot in his mouth and dragged the trainer underwater twice.  The trainer has been hospitalized with minor injuries to his foot. 
CNN interviewed a mother who said that she didn't expect to see such behavior from a killer whale.  A killer whale!  Is SeaWorld doing a disservice to the public when they put on years of this type of show? 
Years ago I brought my kids to a Shamu show at SeaWorld in Florida.  The whales wouldn't perform because the female was in heat, and the male wanted to make sure he didn't miss his chance.  So while the female was clearly distracted and wouldn't do most of  her "tricks", the male circled the rear tank and pounded his tail against the gate that needed to be lifted for him to get into the big performance pool where the female was.  I got a chance to explain to my kids that the act, built upon natural activities of the whales, was being changed by the whales in order for them to act upon even more natural activities.  I thought it was better for my kids to understand that the whales, fun to watch, were still wild animals and not machines.  It's a good lesson, especially for those families that spend as much time in the outdoors as my family does.