This is always a bit of a troubling question for me. It falls along the same lines regarding eating animals—or moreso, harvesting animals to be eaten. It's troubling because on the one hand I certainly DO feel some disdain when I enter a zoo, and observe the animals in their confined habitats. They never seem happy to me. They never look healthy to me. Yet, I still enjoy the opportunity to see animals in a way that I might not otherwise be able to see them.
So it is a double-edged sword, really.
I enjoy consuming meat. I know that animals must die in order for me to enjoy it. I have to accept that I also happen to live in a society where I don't have to kill the animal for my consumption, and because of that, the PROCESS by which we harvest and butcher the animals for consumption is a bit difficult to swallow (pardon the pun). It seems a cruel undertaking that is far removed from the natural process in nature on this order.
My only hope in the end would be that we can find in our zoos, and in the harvesting of our meat, the most humane and thoughtful treatment possible considering the circumstances.