Sorry, @Critterblog, but this is nonsense when you mean that in generall (or if so, then none of any kind of animal belong in captivity).
Most Whales from the order mysticeti are in deed not suited for being kept in captivity because of enormous costs that would be needed (size of the exhibit, special and - in that quantity - expensive food)
But many species of odontoceti can (and should) be kept under the right circumstances. Many of them are extremly threatened or on the brink of extinction already, because of over-hunting, over-fishing and destroying of their habitat (e.g. pollution of the seas). Do you know that a few years ago, beached and dead Beluga whales in Canada had been handled as hazardous waste because they were full of quicksilver and other (heavy) metals? And I'm shure you know, that thousands of dolphins still die in tuna drag nets, and that japanese kill every year thousands of odontoceti in a well known bay.
To save at least(!) a few of them as species, we need empirical knowledge in captivity. Noahs Ark System is possible here as well, but it needs a lot of money of course. If so we have the chance (I don't say it works all over, just the chance) to save species for the future.
But when you mean, that there is a lot to do to improve the current way of keeping (tooth?)whales in captivity, then I'm absolutely agree.