the people vote for politicans who will enforce and create laws suited to their needs and desires.
if a politican enacts a law that is widely not favored you can kiss his career good bye.
and if the police are wrongly interupting this law, then the courts will see that it is sorted out.
odds are, with flint being a largely black city, a black politican created this law/initiated its enforcement, and the population is proly in agreeance.
do you honestly think police officers want to enforce such laws as this?
it's a nusiance to them