Do Orcas Kill on Purpose?

Here is a fascinating and incredibly depressing article about the exploitation of orcas and the end result of keeping them in circumstances that make them crazy.

http://outsideonline.com/outside/culture/201007/killer-whale-behavior-trainer-death-seaworld.html

It's disturbing on many levels, beginning with the death of Ms. Brancheau. It's also fairly graphic so be advised before you click on it.