On Monday, experienced Sea World trainer Dawn Brancheau drowned when a 12,300-pound orca named Tilikum pulled her into a tank after the popular Dine with Shamu show. The tragedy took place in front of dozens of tourists with varying accounts of what exactly occurred.

In the days since, I’ve received many questions about orcas like Tilikum. Several of you want to hear my take on the ethics of captive lifestyles for animals. Some use terms like “compassionate conservation” while others talk about “cruel imprisonment.” Meanwhile, lots of advocacy groups have been speaking out by making lump judgments on all zoos and aquariums–which is not right. To be fair, there is a very broad spectrum in terms of the value of–and responsibility at–each. Further, most handlers I’ve personally met are well-intentioned, and focus on conservation and science. So rather than go into a lengthy discussion on the merits and faults of parks, let’s stick to orcas and this very sad story.

Orcas have evolved to be highly intelligent, social animals, communicating to pod members using sounds that travel underwater. They are also powerful hunters. Tilikum was born wild off the coast of Iceland, where he could travel vast distances until he was captured in 1983. Since then, he’s lived in a comparatively small enclosure, siring offspring, and performing simple tricks for us, over and over and over again.

It’s relatively simple to understand why something might go wrong in this situation.