While I totally agree, the underlying conflict is that Zoos over use the argument of preservation these days. On the other end they certainly have the need to stay entertainment venues, a conflict which they seldomly address.
Recently there was a obviously necessary mass culling of baboons in the Nuremberg zoo which shows some of the controversy [1]
[1] https://www.greenmemag.com/animals/the-nuremberg-zoo-controv...