And to a degree absolving the zoo from at least primary blame. I guess the inquest will decide if they took all reasonable steps. I would imagine the whole staff will be in significant shock, not least the tiger's handlers.
Another aspect to the tragic death.
I am glad the zoo has fairly quickly made statements that the animals will not be destroyed. But the fear of such makes working in an affected zoo challenging.
I have worked zookeeping (big cats in UK) and on occasions we had particularly sick animals (not big cats, not species I ever did more than occasional helping out with) and just the suspicion that vets would need to be called to "put to sleep" casts a terrible air over the zoo (keepers). And when it happens breaks are difficult, no chatting, dire mood, and you know it is the only humane way forward but at the same time just hate the idea of it happening.
Even when introducing tigers for breeding eg exchanges from other parks there is a risk not to general public but that tigers will "not get along".