I don't really think theres anything wrong with zoos. When you get a rescued animal who becomes too dependent on humans to cope, then its the only way it can survive. Animals have also been proven to live longer in zoos. Some species like a certain species of lion are extinct in the wild but are only alive in captivity. At least some of the species can survive and you can easily see them without fear of being eaten

They are also havens of (I'll pose it off as a real species) photos