The District Court opinion has an excellent section on the unconstitutionality of shooting fleeing people in the back. Perhaps you should read it.
You are familiar with the Constitution, yes?
So they made a mistake. Most people would say that mistakenly shooting a drug dealer in the butt is preferable to mistakenly shooting innocent people at home in their beds. Only the courts and law enforcement personnel see nothing wrong with the latter and an offense worthy of ten years for the former. It's upside down and why more and more people have lost respect for law enforcement and the courts.