Yes the way we treat them is definitely a point of contention. > when this "aliveness" is so far off what they are genetically programmed to enjoy as a normal

Yes the way we treat them is definitely a point of contention. > when this "aliveness" is so far off what they are genetically programmed to enjoy as a normal life. I assume, just like humans, other animals can adapt and even enjoy a life partly controlled and radically different from natural conditions. I think the basis should be: are they better off than in the wild? In terms of pain, comfort and stress. And I'd argue that we can give them a better life. But, especially with factory farming, we often don't. In your specific example of aliens raising humans. If aliens let them live in decent conditions, with some added benefits: say diseases, illnesses and poverty completely eradicated, and wars forbidden. But with the caveat that aliens do decide when you die. (Somewhat similar to Logan's run...). I think many may see it as better than our current life.