At some point people will have to agree to the "terms and conditions" for the area they want to enter which could include the policies for policing and law and order.
No one can then complain that they don't like it. If they want to live in the "no cops, fight for survival" area then have at it, and enjoy.
If they enter a "we enforce laws here, expect to be shot if you attack someone" and get themselves shot? Too bad, so sad.