That's a matter of opinion and I respect yours.

Maybe a robot will raise its voice and they become conscious of their wrong doing and they will decide that the best course of action to minimize suffering in their human pet is to end them completely as other solution would always come with a non zero amount of pain

(Have you seen human living in the wild ? So much suffering)

Or maybe you should buy this new breed of human born without nociceptors ? (Its not like the evolutionary need for it is anymore relevant in our robotics world)