Ok, the reason they are allowed to put the sticker on your car, is because they passed a law which says that they can.
They are allowed to pass any law they want, as long as it doesn’t conflict with a state or federal law or either constitution. If you think this one does- sue them.
I don’t think this has anything to do with other people’s property. They could pass a law which says that they can sticker cars on your property also- as long as it doesn’t violate state or federal law or either constitution.
Greenfield is trying to repeal the law, as it should be repealed. It is a stupid law.
The reason it is stupid, is that it harms people with no corresponding benefit to someone else. So the harming people is a waste.
If they think the fine is not high enough, they should just raise the fine. Fines are not stupid, since the money you pay is not destroyed- it goes to someone else. So the harm to you has a corresponding benefit, which equals out.