There's been a lot of public outcry because coastal sanctuaries seem like the only place you can give these animals close to what they need "artificially". What it really boils down to is if you love someone, let them free, especially if you can't take proper care of them. You omitted also that recently the park killed two cetaceans:

> Michael Wiebe, chair of the Vancouver Park Board, said that after two belugas died within days of one another at the aquarium last fall, the board decided they needed to look into whether it was right to keep bringing in more.

The truth is people can't really build a tank large enough to take care of these creatures, or offer them the proper conditions. Killer whales can travel up to 100 miles a day, and dolphins sure do a lot of traveling as well. How do you offer that or allow for the group social dynamics in a cage?

I'm not even sure how good the education value of seeing a dolphin locked up in a tank is. Anecdotally, I went to the zoo a lot as a kid but all I remember doing is gawking. Watching documentaries as a kid I actually heard about their social interactions and natural behaviors. Many of those behaviors don't come up surrounded by people in enclosures.

If we want to "understand and appreciate" a creature it should be on their terms. For dolphins documentaries or visiting them in their habitat seems like the best way, not some aquarium where the parking lot for visitors is larger than their tanks.