School Shooter vs Street Runner - Which One Lives?

 A black male running away from the police.  A white male teenager who has just shot and murdered several  fellow classmates in school.  Who has the better chance of living through an encounter with a police man?  If you read all the stories, the evidence seems to show the white male teenager will walk away alive from his  murder scene while the black man will be carried away dead to the coroners office.

Why is that?  Assuming the white teenage male doesn't kill himself after his carnage, why wouldn't the police fear for their lives and shoot the teenager upon sight, especially if the teen is running away from the scene?  What is it about a black male that compels the police to shoot first and ask no questions later?

In the case of "fear" why doesn't the police fear a white male who has just murdered people?  What is it about the back of a black male that compels the police to shoot at it as if a black man's back were a target in a gun range?

I once parked my car near the entrance of a mall store and proceeded to get out of my car.  A white female looked at me getting out of the car and started to trot to her car.  It was as if she thought I was going to approach her and rob her!  I wonder if that same woman would run from a white male teenager she saw approaching her?

Society seems to ignore the number of violent acts perpetuated by white males.  The notion of a dangerous black male appears to be the narrative that society wants to maintain and have us all react to.   Isn't it a fact that the school shootings have occurred in mostly European American neighborhoods?

Do the police not know about events happening around the United States where their counterparts have killed a black man under similar circumstances?  As I addressed in another blog posts, are not the Police Chief's across the country not addressing the "use of deadly force" policies with the rank and file policeman?  If they have maybe the continued use of deadly force has been reaffirmed by those in charge?  Shooting at the back of a fleeing black male must be in the "acceptable policies" portion of the policeman's handbook.