Granted, Back in victorian times zoo's were soley for the entertainment of us humans, which has created the problems that we see today, with poaching and game hunting, therefore in the modern day we need Zoo's and Animal parks such as Chester Zoo and South Lakes Wild animal park, to raise awareness and funds for the animals in the wild.
unfortunatly not all endangered animals are interesting enough for joe bloggs, and therefore, crowd pleaser Animals also need to be exhibited, Animals such as Zebra's, Girafee and Sealions will attract visitors, visitors pay the entrance fee, entrance fee goes towards conservation for endangered and threatened animals. But the way things are going these crowd pleasers will become endangered themselves and atleast we will have a good captive population with good blood lines that a re-introduction into the wild could be a possibility, but until we sort out the poaching problems, Re-introductions are useless, and were do you propose we get the money from to fund the park rangers and the legal battles to control the poachers.
I feel that bad zoo's with poor standards with the wrong objectives and mission give the whole zoo world a bad name. But the Major Zoo's in this country, infact the world, are legit when they say its all in the name of conservation, 1 way or another.