The threat of legal action is probably the most effective way to shut down the discussion and point out the fact that MacKinnon is talking out of his ass. After all, he should be aware of the binding nature of the agreement the park board has with the aquarium...
It's nonsensical. With all the environmental issues in the world today, surely MacKinnon can find a better platform than focusing on the marine mammals in Stanley Park. The aquarium is just an easy target for him to raise his profile.