Are the robots you're talking about on the same level of intelligence as humans? Because I've always wondered what it would be like if two intelligent and sentient races lived on this planet. Currently, no animal comes even close to us in terms of intelligence, which is why we rule the world without competition. But what if we started to live alongside intelligent robots, would egoes eventually do their thing and invoke some sort of power struggle?
It comes down to wether you should feel guilty for treating them like slaves, which I feel like anyone who knows they are sentient and has a properly functioning mind would do.