Mistakes happen. Murders don't.
In your beloved "legal land" officers are not held to the same standard as us "common folk". How do you get 12 shots as a mistake? Did he slip, fall and pull the trigger 12 times or what? For someone who apparently didn't read the thread before mouthing off (at least I hope so for your sake) please explain how this is manslaughter and not murder. The answer? Its an "officer of the law" and not one of the serfs.
Does that bother you? A coward kills an unarmed man who was seeking help. How dare the family that lost him seek compensation! Stay in your place!
I feel really sorry for people like you. So much anger and so little understanding.
Police officers are trained that if you pull your weapon and fire, you unload the clip. The point being that if an officer feels the need to use deadly force, then make sure the attacker cannot hurt you. I.e., use deadly force. That is why headlines like "XXX number of shots fired at victim" are very misleading. ANY headline or article that counts the number of shots fired has an agenda.
Of course, because you choose to not educate yourself on the training that is supplied to officers of the law, you don't understand that at all.
The mistake here is that he pulled the gun and started firing it. The lawful definition of murder is not met. The definition of manslaughter is. The office is being charged with the correct crime - an essentially accidental death caused by a mistake he made. The same law would be applied to a civilian who killed someone with their car through negligence.
However, I don't expect you to understand that. You already seem to have fully seated an ignorant view of the event in your mind, and to hell with the facts.