Also zoos take in animals that are injured or otherwise unable to be rehabilitated to the wild, often as part of breeding programs, so it’s not like “we captured a wild X to breed it”.
On the contrary, most people don’t read the educational plaques at zoos, and according to polls of zoo-goers, most go to spend time with friends or family — to enjoy themselves and be entertained, not to learn about animals and their needs. One study found the level of environmental concern reported by attendees before they entered the zoo was similar to those who were polled at the exits.
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Also zoos take in animals that are injured or otherwise unable to be rehabilitated to the wild, often as part of breeding programs, so it’s not like “we captured a wild X to breed it”.
Yet zoos also kill perfectly healthy creatures, however, because they are seen as "surplus"
So it's not like they are being just held there while they are healing and then released once they are healed
https://www.bbc.com/news/magazine-26356099
From the article