Witness Confident. Interesting idea. Using Google Maps to create a tool to map street crime could be very useful. You’d be able to see where the crime hotspots are near you, especially as many muggings and the like go unreported and an area may not be an official police hotspot for crime.
Might not work. Might lead to less desirable things like vigilante groups staking out areas and dishing out ther own justice. Like I said, interesting though.