When forensics shows multiple gunshots in the back, cops do get charged. It is tough to explain why you needed to shoot someone multiple times in the back to save your life.
Not really. Son of the janitor where my wife worked was shot in the back multiple times and died while fleeing a traffic stop (turns out he had some weed on him) and he was only a passenger. Was ruled a good shoot BECAUSE nobody was there with a video camera to show the truth.