Taxpayers are going to pay out a lot of money in settlement for this shoot. It appears that there is a lot of politics in play here, I mean, SPD says the shoot was unjustified, and the prosecutor said they will not file charged because they don't think they could win a criminal conviction.
They both go into a room, the ruling that would result in a civil case, not criminal, ruled that Birk was not justified, while the criminal aspect of the case is ruled, well, basically by default, found to be justified. I think the prosecutor believes that Birk was unjustified, but realizes that a criminal case would be pointless.
Let's think about this for a moment, there are two witnesses (at least) that testified that Williams was not threatening. There is video footage that show Birk out of his car, approaching Williams, with gun drawn, the four shots are fired into the side of Williams...Birk doesn't identify himself as an officer, and Birk gives Williams not time to even turn around to see if he was the one being yelled at by Birk.