Personally, I think zoos are a good idea.
First, animals are generally well kept there. They are well fed and cared for. They are free from their natural enemies and diseases. A few years ago I went to a zoo and saw healthy and happy animals.
Second, some might say that they are separated from their natural habitats and their wild instincts. A majority of them were born in zoos and would just die in their natural habitats. A lot of people, especially children, love going to zoos and learning new information about animals.
So that’s why I think that zoos are more of a good idea than bad.