Cops are only there to hand out speeding tickets in general, and that's about the only crime they manage to stop in progress on a regular basis.
At least it seems that way.
They are not even very good at finding the perpetrators after the crime. We had a shop building broken into 3 times and stuff stolen, and they even figured out who it probably was, but no one was ever arrested, and they won't even tell you who it is because they are afraid that you might administer some street justice.
However, they will find time to arrest you if you do administer some street justice.
We are on our own and we always have been.