The details are kind of boring and out of date.
We were repeated victims of minor property crimes. The police spent maybe 5-10 officer hours investigating, which is more than I expected.
However, they failed to run a (unusual for them, but legal) database search that would have almost certainly identified the culprits.
I think they would have done it if the crime was higher priority for them, but ultimately, they need to prioritize their resources on serious crimes and things that make for good public relations / internal politics (like if we were friends with the mayor or something).
As the victims, we had every incentive to pursue the investigation, but no legal ability to do so.
I'm well aware that our experience was far, far better than is typical in, say SF or Oakland. In our case, they probably would have made an arrest if we had a positive identification of the criminal.
That's not really the case everywhere, which is a separate issue.