The modern law enforcement apparatus is an impressive thing. It's no longer about men with clubs standing on street corners and cracking heads. Law enforcement is a scientific endeavor encompassing everything from high end forensic sciences to sociology and psychology. It's a field of ideas now, and it suffers from the same malfeasance of ideas that every other aspect of Western culture does.
The modern police force does not enforce laws out of some abstract sense of justice, its only goal is the social good. And the social good calls for not enforcing laws, as often as it calls for enforcing them. Law enforcement does not exist for the sake of law, but for social stability, and how to achieve that social stability is still a matter of debate.