Look, we get it, you are deep into this cause. I agree with some of it, but as always situation is way more complex than simple zoos = prisons for torture.

There are zoos which have massive spaces for animals and generally animals are very well taken care of, there are 'zoos' full of animals that would otherwise be dead (ie taken from smugglers, illegal ownership, overpopulated, injured in accidents etc.).

You can't watch most of say african big animals in wilderness on your own, even if you go on African safari its very much modern zoo-like experience.