Apparently, blue city subs are going to start censoring crime, urban decay, homelessness, looting, etc. cases because a poster has either a history of posting only negative stories to the cities sub or might not be a resident of the city.
First, this is just burying their heads in the sand.
Second, LA is one of the biggest cities in the US. How do they know a poster does not visit the city regularly, have family in the city, have business / investments in the city, or has temporarily relocated (military, job, college)?
Third, this creates a self selection issue. A person that is liberal or progressive might not even know about the issue. If you post too many crime stories then you risk being banned. If grew up there and moved out (but might move back or have and attachment to the place) banned.
Forth, this shit will never be applied to progressives. If there is a negative story about right wingers commiting crime, you could get a person posting on how they moved to Europe decades ago shitting on the red state and it's allowed.