I know a story like this is a farce with little basis in reality but I have to imagine if an area was infested with nutjobs trying to kill cops, most of them would probably just decide patrolling the area is not worth it, crime would rise and there would be stories like this.
no subject
https://www.cbsnews.com/news/rash-of-homicides-in-west-baltimore-have-residents-asking-where-are-police/