If as you suggest the AI in question can feel pain and suffer, of course I would care and not want it to have to experience that. Why would I? I'm not a sadist or a monster, or a Utah legislator without any human feelings.
It's like the scenario, "if you could get away with murdering one person, would you do it?" Of course I wouldn't!!! Whether or not I could get away with it, I still have to live with myself and what I do. And I have a thing called "morality" that I live with and a respect for life that goes beyond my own self-concern.