We can all be "Monday morning quarterbacks" here. Without all the details,, or the direct info the officer had,, we can create any & all types of reasons why or why not it was justified.
But let's look at it a bit differently.
Let's say you as a private citizen has been told a guy is going around waving a gun & threatening people. You go to your house,, and find a guy sitting on your porch,, with a gun,, and he raises it or starts to point it at you. What will be YOUR reaction?
Now I know it's not exactly the same thing as what we see here.
But all too often,, I see most of us here,, who carry & believe in self-defense,, comment on how they would respond by saying they would shoot the individual.
Action is always faster than reaction.
Almost a year ago,, a NCHP friend had a guy pull up a gun and shoot him in the chest with a .44 magnum. He had to react AFTER he realized he was under attack. He was able to draw & return fire fast enough to where the guy didn't get off a second shot,, but he reacted with 6 rounds fired. He told me directly he didn't count the rounds. He just fired until he felt the threat was stopped. AND,, he said the guy moved around some after he'd gone down,, and he thought; "Please God,, don't reach for that gun!" Because he knew he'd have to continue shooting.
We as gun owners hope & pray we are never confronted with an armed person to where we are placed in a SD shooting. But if we are,, we will all feel as if we were justified. No matter what others think,, we will feel it was justified. We may second guess ourselves AFTER the fact,, (especially after a harsh grilling by LEO's) and have regrets etc,, but in the moment,, faced with some reasonable fear of being attacked,, we will act in SD.
A LEO puts on a uniform,, that to a portion of the general public,, makes them a target for whatever. LEO's are spit upon, cursed, accused of crimes, attacked, killed, or whatever JUST because they are LEO's.
We civilians are not treated that way.