If there's anything Sci-Fi has taught me, it's that sentient machines will either be our salvation or our doom, and in both of those cases, treating them like they have no rights isn't good for our health in the long run, so to do so is stupid.

As for clones, considering how often our bodies replace all our cells, you aren't remotely close to the same person you were even a year ago, which proves that it's our minds and experiences/memories that make us who we are. With that in mind, and knowing many other people would agree, the idea that everyone would be ok with a clone slave force is absurd. Maybe if they were brainless chunks of lobotomized flesh incapable of learning and totally empty of sentient though, but otherwise?