As said, the police are counting of this activity because they know they it takes time for them to respond to the commission of a crime.
Most of my neighbors are edgy about this matter and it wouldn't be too surprising to learn that someone was shot during this time. Lot's of retired folks live around here and they are nervous about their safety.
I am in Georgia BTW.
I have no doubt that police departments greatly appreciate neighborhood watch associations. Having an alert populace reporting crimes and suspicious activities helps them to do their jobs. But I don't know of a single police department that would want neighborhood watch associations do their job for them.
would add that most of my neighbors are armed when they patrol the neighborhood. And, frankly, I think they are quite nervous and, perhaps, a little scared about what they are doing.
Armed, nervous, and scared are a bad combination, and it is likely the reason why this incident went so badly wrong.