Unfortunately many laws fall into a category that is not intended to implement ethical rules or as the book states... even be consistent with them. Laws against murder and theft because we are obligated to obey these laws, not because they are laws, but because the laws implement obligations and prohibitions of ethical rules.
Give an example of a law that enforces a particular groups idea of how people should behave. Many political, religious, or ideological organizations try to promote laws that require a person to act or behave a certain way. Laws such as Prohibitions on gambling and alcohol, requirements for recycling, and there are some that require stores to be closed on Sundays.