What is the main idea of "What zoo critics will never understand"

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Dr. Jane Goodall recently made two statements critical of zoos and aquariums. She said two elephants in a zoo in Seattle should be released to a sanctuary and that SeaWorld should be shut down. After the Woodland Park Zoo in Seattle invited her to learn more about the zoo’s decisions regarding elephants, she took them up on their invitation. I admire Dr. Goodall for her willingness to learn more and re-evaluate her initial comments. I hope Dr. Goodall will also engage in a conversation with SeaWorld about her concerns.
I encourage other zoo critics to do the same thing—engage in a meaningful dialogue so that together we can do the best thing for animals. I’m growing weary of the us-versus-them mentality. Although zoo critics and zoo champions have some differing philosophies, we all have the same priorities—animal welfare, conservation, and education. I am confident we can co-exist and be more productive if we work side-by-side.
Visiting zoos and aquariums is the largest recreational activity in the United States. More than 175 million people visit zoos and aquariums accredited by the Association of Zoos and Aquariums (AZA) each year. Zoos and aquariums play a critical role in the survival of endangered species and allow people from all walks of life to experience and learn about the animal world. Animals in zoos are ambassadors to their cousins in the wild—they educate people about the importance of wildlife. After a visit to the zoo—listening, seeing, smelling—people often leave with a newfound understanding and compassion for wildlife.
AZA accreditation requires excellence in animal care and welfare, conservation, education and scientific studies. There are more than 200 accredited institutions, and in 2013, they donated nearly $160 million to support about 2,450 conservation projects in more than 120 countries. Species such as the black-footed ferret, California condor, Mexican wolf, scimitar-horned oryx, and Przewalski’s horses have overcome near-extinction in part because of zoos’ commitment to conservation.
Critics say the only place animals belong is in the wild, but those boundaries are shrinking each day. Having traveled the world, the only places I consider truly “wild” are Antarctica, parts of the Amazon and some places in Africa. Even in Africa, the “wild” places tend to be national parks with guarded boundaries. Animals face many challenges, including habitat loss, poaching, severe weather, and war. The “wild” is not necessarily the idyllic place people imagine. Poaching has decimated the northern white rhino population—the last known male has his own personal 24-hour security to ensure he isn’t poached for his horn.