Important to keep in mind, while tigers may have statistics showing a better life than in the wild, reproduction in the zoo has been a problem. There is still more thay can be done but I agree that there is valid arguments for zoos
And who paid for those statistics and what measures did they use? I'd love to know how you quantify a tiger's happiness.
Granted, peta and humane society have exposed some zoos mistreat many animals which may swing the statistics in favor of the wild. Nonetheless, we have laws and those laws are meant to protect the animals even if they dont succeed 100% atm