Police face an insoluble dichotomy. Where public safety, such as your lights breaking, is best facilitated by the service you received, an entirely separate system and training are required, while investigating crimes is something else completely. Since criminals inevitably seek to control law enforcement, for obvious reasons, law enforcement in the USA has suffered far longer infiltration by criminal gangs than has Germany, because modern Germany and it's institutions is so much younger than the US states.
The only solution to this dilemma I can see is the elimination of institutional power that is beginning as the decentralization of the means of production eliminates the advantages of centralization by eliminating parasitic losses of wealth endemic to centralized production.
RE: The 5th Amendment and You