But, being cops, they are excused from wrongdoing.
Why?
They should be charged with manslaughter, at a minimum. Second degree murder seems even more appropriate.
But the police (and the union) will defend them. They were just “doing their Job” and they needed to “make sure that they went home safe”.
I was always taught, in LE and civilian classes to be "sure of the target and what was behind it" before shooting.
Poor lighting is no excuse.