Animals in some zoos are treated very poorly. I’m sure everyone thinks animals should be treated better in captivity. Zoo animals are wild animals that were captured and used for human entertainment.
There is a 96% chance that an elephant is treated poorly in entertainment. Extremely threatened species are not suppose to be bred in zoos but they are. There are more tigers held in captivity than there are in the wild. 75% use animal abuse in their facilities.
The surplus of animals in zoos are killed because there simply isn’t enough room for them, even if they are healthy. Polar bears nowhere nearly have enough space to roam and to be completely happy. China has over 5,000 tigers in captivity that they use for traditional medicine.