Cops rage causes death of citizen

How does a 4 year veteran of the police force allow a minor right of way driving incident to escalate into the death of a civilian? I always thought that the police were here to serve and protect, not take out their personal grudges on innocent citizens! This officer should be incarcerated for second degree murder, or minimally, criminally negligent homicide. All he had to do was act like an adult and let the driver get his way on this one. Many of us tolerate this daily. Instead he did exactly what he should not have done and antagonized and spurred on the rage by confronting the driver like a child. Where were his skills as a sworn officer or his tactical ability to calm a situation? There is no excuse here. Let justice be done. Look at it like this, he was off duty at the time so treat him like a common citizen rather than as a cop and maybe that will allow justice to prevail. I have so little faith in the police of this city. I bet he fled the scene to avoid the field sobriety testing mandated after a police shooting, hum?