Well that's what you get for exploiting a wild marine animal and confining it to a bathtub relative to the size of the ocean. Tilikum wasn't born in confinement, he had the pleasure of being a wild animal at the place he should be for several years until he was captured in Icelandic water. That's if my memory recalls.
Seriously, the only places where wild animals belong is their wild habitats, or if they are endangered, zoos that treat them right and focus on rehabilitation. Nowhere else. Not in some mansion where a chimp finally goes psycho and rips the face off a woman etc. And I believe I read somewhere that some American keeps an elephant as a pet??? Ridiculous.
They have feelings. They are intelligent animals. They are social animals. They have many needs akin to our own, like family and social structure and environmental aspects which we humans simply cannot imitate or make up for. And unfortunately when a caged animal goes berserk and hurts or kills someone, the blame most usually goes to the unfortunate animal, not the society of the human owners that think keeping wild animals to exploit them or as pets is something that is not horribly and naturally wrong.
Just so you know, I'm not a PETA supporter. I stand by most of their ethics, but not entirely their methods to convey said ethics.