The overwhelming share of shootings in the US are from arguments. They aren’t from people committing a crime, or people murdering for revenge, they are from heated arguments, and in the moment of escalation, someone shoots someone else.
Wealthy areas have much less shootings, but even between neighborhoods with similar socio-demographics, there are some with high shootings and some with low shootings.
Experiments that involve cleaning up vacant lots in neighborhoods, and teaching men how to respond to provocation, have found drastic reductions in violence.