Whether a rule has been violated is a meaningless concept outside of the context of enforcement.

Natural language itself must be interpreted within a context.

And yet, the courts and the police are separate entities.

Courts consider the context of enforcement, and police both decide whether something is a violation as well as handling enforcement.

And at least in the US generally you need to have been harmed, or be likely to be harmed by enforcement of a rule to even have standing to challenge it.