> Putting surveillance for gun crime in areas with the highest rates of gun crime is obviously what’s happening.
This is in fact the crux of the problem. By significantly increasing monitoring of areas with higher crime rates, you inadvertently create a vicious cycle feedback loop: The more you monitor an area, the more samples you get, biasing the stats (because your sampling is no longer uniform). Then these stats are used to justify more monitoring and policing in the area, further biasing your data.
This is in fact the crux of the problem. By significantly increasing monitoring of areas with higher crime rates, you inadvertently create a vicious cycle feedback loop: The more you monitor an area, the more samples you get, biasing the stats (because your sampling is no longer uniform). Then these stats are used to justify more monitoring and policing in the area, further biasing your data.