That data is sourced from the FBI's UCR program (https://www.fbi.gov/how-we-can-help-you/more-fbi-services-an...) which relies on _voluntary reporting_ from law enforcement agencies.
EDIT:
There is no mention of UCR as data source, where did you get it from?
https://www.neighborhoodscout.com/about-the-data/crime-rates
From the FBI itself:
> Pitfalls of Ranking
> UCR data are sometimes used to compile rankings of individual jurisdictions and institutions of higher learning. These incomplete analyses have often created misleading perceptions which adversely affect geographic entities and their residents. For this reason, the FBI has a long-‐ standing policy against ranking participating law enforcement agencies on the basis of crime data alone. Despite repeated warnings against these practices, some data users continue to challenge and misunderstand this position.
How do you even define a city in this case? You say those are normalized crime stats per 1k residents - how big are the metro areas? Are there any cities that also count a portion of their suburbs as part of the city? Does doing so reduce per-capita crime stats? etc...
My suggestion would be to thoroughly vet your sources before posting their conclusions as fact.
If you know where their source data comes from and why its so accurate, feel free to educate me. Their own site says this:
> Q. Why rank cities on safety even though the FBI cautions against it?
> A. This report and/or our data cannot and should not be used as a measure of the effectiveness of law enforcement due to the myriad factors that can contribute to crime in a community.