Well, I quit going to zoos long ago, as I started seeing the misery in most of the animals kept there. Bears and large cats seemed to exhibit it most, by pacing and or standing in a corner swaying back and forth.
When you keep such animals locked up, I can't for the life of me figure out why anyone would be surprised that the cat went on a rampage when he did get out. Prisoners in penitentiaries have been trying a succeeding to get out for years. They have nothing else to do.
They are (animals) what they are. I say do away with zoo's and watch National Geographic if you want to look at a tiger.