gangs make money by selling drugs. they use that money to buy guns.

they then have turf wars over where they can sell drugs.

that leads to shootings which strike innocent civilians.

what do you suggest the police do? allow those gangs to sell the drugs and kill each other and other innocent bystanders?

also this thread is about whether they should monitor shootings...

I am not proposing to do anything. I just described a possible mechanism for how additional policing can lead to additional incarceration, aside from homicide and attempted murders.