I assume gang related violence kinda skews the concept of the victims and perpetrators knowing each other.
The pilot had a homicide reduction of 30% iirc but we will see over time as it expands to whole city how it plays out
In the same way that being served with a lawsuit means likely to spending some time with lawyers or in court, a low-level criminal being shot indicates that his coworkers in the enterprise are likely to spend some time in shootouts.