SeaWorld is a wonderful park. I think you would all love it. I would go. If anything exposure to parks like this give people a love of animals and many who go into careers or volunteer work supporting animals developed their initial love at places like SeaWorld and zoos.
I've seen Blackfish (took my kids too and talked to them about it), and have always had mixed feelings about animal in captivity. It's always bothered me, but I still go to these kinds of places with my children who love all kinds of animals, especially marine mammals and fish. We go whale watching and things like that too, to see Orcas, humpbacks, etc. in the wild also. // But life is full of all kinds of hypocrisies -- think of the big carbon footprint my family does to get on a big plane, go some place remote to see animals in their natural habitat and feel more connected to nature.
I'm guessing that the movie is slanted to be anti SeaWorld and not totally balanced, just like 60 minutes shows lol. But I'm sure much of what is stated is true. As far as marine parks go, SeaWorld is probably the best of the best. But, of course, there is a question of whether marine parks, zoos, etc. should even exist at all.
Do you have problems with animals being raised for food? Are you a vegetarian? How to do you feel about domesticated animals as companions to people and those that work in the police force, military, and as disabled person companions? It wasn't their choice. What do you think about the conditions of animals at shelters, rescue facilities, etc? What about the recent poaching of some of the rare elephants in Africa for their tusks?
Do you contribute monies to animal charities? Are you an animal rights activist? Do you do volunteer work to improve the lives of animals? // I do care about the humane treatment of animals, but I care about the humane treatment of people even more, and there are lots of problems in that area too.
All I will say is that many people who I know who saw Blackfish, decided to boycott SeaWorld, and suggested that I do this too, to me seemed quite hypocritical. If you do decide to skip the park, though, you are not alone, and it's definitely your own personal decision/choice.