For example, in the U.S. there's a culture that if a government is not infringing on the rights of its citizens, it has done enough. For example, the secretary of state that runs my DMV does a good job of respecting the human rights of the disabled, and a good job of respecting the human rights of their employees, but I don't get the feeling they feel compelled to provide good service.
If they had a duty to be the best administrator of a DMV around, they would need to be focused on accessibility, their employees, and the level of service provided to their customers. An administrator who did not focus on providing great service could be chastised for that in a way I don't see happening (in my state, at least).