Look at any job where the employees can't be fired, perhaps civil servants or teachers with tenure. Since they're not judged by merit, many of them don't care about success (I said many, not all). They just show up, put in their time, and go home. How does that contribute to society?
You're kidding, right?? What does a person's incentive have to do with how they contribute to society?? A letter carrier who is not interested in furthering his career but simply does his job is still providing a service.
