While headlines tend to focus on falling clearance rates in large liberal cities, the decline occurred nationwide in both red and blue cities, counties and states. The violent crime clearance rate, for example, fell considerably between 2019 to 2022 in big cities, which tend to be led by Democrats, as well as in small cities and suburban and rural counties, which tend to be led by Republicans.
That’s the purpose of the institution “police”. You’re ignoring that every institution is made up of individuals, and the sorts of individuals that like joining the monopoly on violence tend to be of a very specific sort.