The reason is that most of the time we have traded to do nothing in favor of a better legal system. Looking at police records here in Sweden, and it seems that

The reason is that most of the time we have traded to do nothing in favor of a better legal system. Looking at police records here in Sweden, and it seems that the average reported crime has single digit resolve rate. We could lazily improve those numbers by simply lower the burden of proof and pay more, but through time we have chosen not to. Lets make up some estimated numbers that the average resole rate is 8%. Would we be willing to double the police budget to get 16%, assuming falsely that we are lucky enough that double the budget doubles the result. What if we make assumptions of guilt and raises the resolve rate to 20%, but also increase the false accusations by 2000%? What about a camera in every street, testing the case that camera surveillance decrease crime (just like London). I think authorities are mostly doing their jobs within the limits that we gave them. It can naturally be done more efficient but we are talking about such low resolve rates and that makes it look like they do nothing in most cases.