Animals like orangutans and gibbons and lemurs are nearing extinction though and they're
The zoo in Jersey (founded by Gerald Durrell) only has animals in that are close to extinction.
I think that you're giving an incredibly egocentric viewpoint if you believe that species/creatures should only exist if you approve of it and enjoy sharing your earth with them. If a mangy dog is in the street and you don't appreciate the smell it's giving off, do you kick it into the gutter until it's dead?