There's an old saying - call an ambulance, call a cop, call for a pizza; see which one arrives first. It seems that in Baltimore, we have at least part of the answer.
I'm pretty sure the standard for attacks on Paramedics is *Zero*. Hell, even the Nazis and/or Wehrmacht didn't shoot at Medics.
IIRC, in Detroit several decades ago when there was a spate of arsons, fire trucks were being shot up.
When the firemen refused to answer calls in some neighborhoods without police escort, an idiot judge ORDERED them to.
Their response was short and to the point: "No." Incoming fire trumped a court order.
All this says something about the denizens of Detroit's 'hoods back then, and Baltimore's today.