Do you really think SeaWorld executives really care about people seeing these animals for conservation? Its a huge corporation that spans the world with many investors
http://blackfishmovie.com/ Investors they have to answer to. The Orca is Not! endangered there is no scientific reason to keep them in a bath tub until they go crazy. Its documented they are highly intelligent creatures, and highly social ones. To keep them confined in such places with other individuals they are not familiar with is tantamount to torture. And its all for greed ; To keep selling those $25 stuffed Orca dolls.
SW makes an average of $63 per person rolling thru those gates. How much do you think they'd make without those whales? The Orca that went ape and killed those people in the movie Black fish for years spent its evenings in a pen that didnt allow any movement. Thats about 16 hours of its day, is it any wonder it went bat crap and started whacking the humans tormenting it? Even still its penned up cause its worth a fortune as breeder. And what "science" was ever learned from the poor thing?
What science was ever learned from Irwin jumping on the back of a sting ray or a croc? He knew both were dangerous and certainly wouldnt recommend others doing it. But he just couldnt help himself with those cameras rolling could he? What science did he learn by dangling his one month old baby near a croc? We already know a croc will eat a baby. Did you know after he got kilt by a stingray the authorities started finding lots of Rays with their tails cut off, dead on the beaches of Australia? Nothing like some pay back in the name of conservation.
Well the man was popular, so is "Kim Kardashian", I felt no glee when he died. But he made his cash by jumping on all kinds of critters and messing with them, then turning it into a reality TV show hiding behind "science". None of the good things he did after changes that. Like this dinglebrain with the 26' white skark. Staying in the cage wont make him famous "thats been done" but getting out of it just might get him his own TV show. Im sure he would have loved leaping on it, imagine how that might pay?
And the science? What great science.

On the other hand. Those few that are in "bathtubs" letting people see them up close probably do for for the conservation of the various species by putting a face on these creatures then millions of dollars in advertising ever could ever hope to. Same thing with zoos.
Do you care about the Rio Pescado stubfoot toad, The Red River giant softshell turtle?
Odds are you have probably never heard of them let alone saw them. At best maybe you have seen pictures of them which isnt quite the same as seeing them in person. Yet both are on the verge of extinction. Yet had you seen one in a zoo. You just might say "Wow. those are pretty cool.There are only 4 Red River softshell turtle in the wild? Wow we should do more to preserve them"
Still. Maybe not. They arent exactly the sexy species Orcas are. And we as humans tend to place preference in importance of animal species much in the same way we place vulue on other humans. How sexy they are