There’s something about having servants – even if they seem to love their jobs – that is vaguely disturbing. It offends many Americans’ sense of egalitarianism. But robots are different. They aren’t human. And that’s a big part of their potential appeal. They don’t eat, they don’t get offended and they don’t ask for pay raises. So if a robot could do what a human servant could do, wouldn’t you want a robot?