Police are human too and can be beaten down and frustrated when enough people want to break a certain law. Example: Uncovered super bright halogen lights mounted above the cab of a truck or off-road vehicle have been illegal for as long as I can remember. I am not aware of that code changing, yet the police do not enforce it anymore. Example 2: Heavily tinted windows. The police used to enforce that code but have since, in large part, given up. They also seem to have given up on the blue tinted headlights and super-bright headlights that shine upward into oncoming motorists eyes.

There are only so many police on the street and they pick their battles too. If a green turn signal is illegal, a reddish light mounted above the headlights that obstructs the driver's view through the windshield would be illegal too. You can talk code violation all you want, but good luck getting the police to enforce it if there is little harm being done, is a new social trend and the complaints are minimal.