Are You the Kind of Man Who'll Shoot an Unarmed Man in the Back?

From an NPR article:

"Three undercover detectives were found not guilty Friday in the 2006 police shooting of Sean Bell, a New York case that made national headlines.

Delores Jones-Brown of the John Jay College of Criminal Justice says the case has drawn attention because it's part of a larger pattern of police shooting unarmed suspects."

I don't understand. Of course the cops are shooting unarmed suspects. If they try to shoot armed suspects, the suspects are liable to shoot back.