When cops are not proactive, this is exactly what happens. Drugs, alcohol, armed young males and hot weather are a volatile mix. Good street cops know how to make timely interventions if allowed. They won’t if they know their backs are not covered.
Hot weather is the odd factor in this mix. I noticed this factor in DC when I lived around the region for 3.5 years. If you get a cold front with freezing temperatures for a week....there’s never a murder or shooting. You get temperatures up to around 95 degrees, and you might see five murders in one single week, and another dozen assaults.
The cops are what keep the violence etc. “in check”.....at best in black neighborhoods. Their culture of violence, drugs, barred windows and doors...and all the other problems are not going away no matter how many police are in their neighborhoods because the police are not the problem.....the people in the their community are.
When we view videos of their fights, those on drugs etc. Most of the observers laugh and encourage the behaviors.....rare any of them will intervene. Generally when things get out of hand THEN they call the cops or the Emts........Like kids calling mom and dad when they get hurt.