Watch a shark attack a stingray at an aquarium, all to the delight of the children watching

Not really circle of life as much as bad husbandry.

But then I wonder why I feel worse for the animal that was for show but instead got eaten, but less saddened by the thousands of animals that will be caught/bred as food for this one animal?

I cant rationalize it, my only advice for myself is not to support a zoo.