For a lot of states, I bet if you excluded the stats from just one major city, the whole outlook would change. For Michigan, for example, take out Detroit. I like crime maps that leave out state boundaries and just go by rural/urban.
There is a way to figure out what percent of crime is not reported.
The Census Bureau conducts National Crime Surveys that just asks a statistical sample of people about crimes they have experienced.
https://bjs.ojp.gov/programs/ncvs
Those figures can be compared to “official” reports by local and state police departments as well as the FBI.
Or exclude the stats from one particular demographic.