Hi TonkGirl, I am one of the people speculating, and I have a different view to you. I understand the bonds between staff and their animals, but modern zoo animals are not pets, and they are held captive in zoos for conservation, research and education. People work hard to pay a lot of money to see the animals advertised by the respective zoo and in my opinion, the zoo should have a succession plan in place for the two zebra that had long term health conditions. In the context that the huge ‘Savannah’ area of the zoo is now fairly empty, I believe it is ok to think about what zebra, if any, will replace them.
To ‘take a moment’ may mean receiving poor reviews and less than satisfactory visitor experiences which in turn costs the zoo and lessens the conservation work they can achieve long term.