Do you not know that the conservation and preservation of endangered species is one of the missions of the AZA and and its member zoos?
Don’t forget that “Extinct in the Wild” is an IUCN conservation status that exists solely because the only living specimens exist in captivity or otherwise non-naturally-occurring populations. What’s more, several species now only exist due to the work of zoos and similar institutions.
Correct. Some here have suggested banning Least Concern species as they hold less conservation importance. While there are valid reasons why accredited, conservation-focused zoos keep some Least Concern species (see here),
it is generally agreed that threatened species should be prioritized.