I hope you know that furthers @Iben 's last point. Each person finds different value in different animals.
Again, people should be allowed to argue over which set of standards they think are better in order to persuade the other person or others and people shouldn’t interfere with their right to speak. No one has to respond to them, including the person they are replying to. But criticising them for just speaking is the norm in this forum. So is banning them. Butting in and stopping any conversation over "standards" to "protect the vulnerable" is everyone's duty.
For example, the Asiatic Lion is not really a separate sub-specie of lion as recent research has shown that the common African and Asiatic lion are the same sub-specie. So unless the current West African Lion is renamed as the Cape Lion (extremely uncommon in captivity), we are going against the science here. Btw, zoos that talk about their Asiatic Lions having “conservation value” are lying to you. They are merely trying to justify their keeping lions to the zoo-sceptic crowd. In reality, a vast majority of zoo-born animals are genetic hybrids which would pollute the genome of the wild animals if we were to release them.
Walrus is not common in captivity, true, and this may be a point against them. However, I’d note many animals not common in captivity have been added. And Walrus is a top 20 zoo animal in terms of surveys of what animals people want to see at zoos. The only other animals from the below list not in the game are fully aquatic animals.
So go ahead and criticise/ban me.