My take on this is different. The police officer is free of charges, but he lost his job anyways. Look at the US as a whole. Very few places in the world have the same police system as we do. But you can't read a paper or watch the news anymore without hearing the police somewhere in the US shot and killed an unarmed suspect. Even during the most volatile of riots in the past very few were killed, and even those few had to deal with the public protest at a grand scale.
A majority of police officers a decade ago never drew the weapon unless they intended to use it. They also had good reason to use it. Today is not the same as a decade ago. Second nature or what ever the reason people have died in their homes and on the streets.
It will not get better until our courts get a grip on how they handle cases, and penitentiaries are treated as rehabs instead of solitary confinement facilities. I just think police are as fed up as much as the suspects, courts, and attorneys are. Something has to change. It's very obvious that our system of punishment is not working. It never worked for POW's so why does our penitentiaries treat them the same?