[asdff]

Observation is useless if police aren't keen to taking effective action in the first place.

1 in a million crimes it is probably super useful, but for the 999,999 other times some people get into a fight, something gets stolen, two people get stabbed in a grocery store with many cameras and security guards and dozens of witnesses (using an example from my neighborhood in LA this past September), nothing happens because the perpetrators are long gone and will never be found by the time the cops show up, if they do at all. You can't effectively keep 500 square miles safe with only 9000 cops.