In a reasonable country, the prosecutors office and the police are supposed to prioritize crimes that cause the greater danger to people, and/or to the society.

In a reasonable country, the prosecutors office and the police are supposed to prioritize crimes that cause the greater danger to people, and/or to the society. If prosecuting is unlikely to increase safety and well being, the resources are better used where such positive effects can be achieved. Prosecutors and police alike certainly doesn't have a perfect track record in this regard, there's still quite some room for improvement.