Did you not read? It was a protest. It was not a zookeeper feeding. It was meant to be horrifying because the shareholders were furious about not making a profit. So now I have answered your “question” twice.
No, you have not. Would you still feel the same way if they had shot the donkey before they fed him to the tigers? Or are you upset that they did this in the public eye? They actually make documentaries about animals killing and eating other animals, to me it makes no difference if it was a protest or a normal feeding ritual.
From the article:
“Although the incident with the donkey was not sanctioned, zoos in other parts of China regularly feed live animals to tigers for the amusement of the public,” the newspaper writes. “Guests visiting one tiger sanctuary in north-east China’s Heilongjiang province can pay to have a live cow or chicken hurled into the tiger enclosure.”