No. Pandas are animals that evolved to fit a particular biome. The fact that they don't reproduce well in captivity isn't a mark against them, it's a mark against captivity. They, like almost any animal, are threatened by fragmented habitat and are luckily cute enough to get the funding necessary to conserve them. If not for similar conservation efforts all kinds of animals of varying degrees of cuteness would be dead as well. Nobody is calling for the abandonment of the black footed ferret project because ferrets are cute and somehow that makes them less-than in the eyes of slack jawed edgy douchebro comedians.
Dolphins are mammals and enjoy things that mammals commonly enjoy, such as intoxicants, and if you're going to pretend to be shocked and disgusted by a dolphin getting high you'll also have to throw away reindeer and every other animal that enjoys fermented juices including fruit flies. Dolphins are perceived by humans as being more intelligent and therefore more culpable to "sins" than other animals but humans can't even agree on what's immoral let alone expecting a non human animal to magically ascribe to our same biases for no reason and assign the animal negative traits when it fails to meet that asinine expectation.
The sooner you stop trying to shoehorn in some fake idea of an animal being more or less deserving of its existence the easier it will be to get through to people.
Which I should just go ahead and say right now, the OP was inspired by an article about a woman who was injured in a dolphin petting pen on vacation and the comments were full of people blaming THE DOLPHIN because "theyre nasty violent rapists" and not the humans, who captured it, forced it into a pen, and climbed and petted all over it knowing full well it was a large wild predator that had no business being swarmed by untrained fucking idiots.
It may have been haha funny shocking animal fact at first but now it's ruined because too many people started buying that shit for real and now we have people who no longer want to preserve the sea otter because it doesn't know what consent is.