is the robot supposed to tell the difference and not serve the fat human too much food? its doesn't it does what its told
What happens when the diabetic is served too much sugar? Who's liable? the diabetic for telling the robot to server them sugar. have some personal responsibility. If a diabetic told the robot to bring it an apple and it instead brought and apple shaped sugar ball that was hard to discern from an actual apple then sure we can blame the robot or the manufacturer. but when the robot does what its told the liability should be on the person who told it what to do.
I'm sorry, but you seem to be speaking the language of common sense.
As you know, this language is no longer spoken in US courtrooms, and has all but been outlawed altogether in the legal community.