Shotspotter is useless (5% is at best par for the course for every intelligence appliance I've used myself) but your expectations are unrealistic.
You're berating them for shaking down street kids for intelligence, then berating them for not taking down gang leaders? Lmao.
That's an impossible situation you've created. How about you demonstrate how policing should be done?
> why would they need microphones to tell them where gunshots go off?
Not where, when.