As in all cases I will reserve my judgment until more facts come out. But just speaking in general terms The police have very dangerous jobs that most of us would never want to do. They put their lives on the line every day and I’m thankful for what they do for all of us. Now with that said, because this is what they signed up to do they are not allowed to go into a situation with a shoot first and ask questions later mentality just because they feel there might be danger about to happen. If that were the case they would be allowed to go to a robbery and just start shooting everyone there. That would be the safest thing for them to ensure they go home, but not for the public and that is who they are hired to protect. They are expected to accept a certain amount of risk before shooting at someone before they even present any danger. This would be like a fireman refusing to enter a building because it might be dangerous. IT WILL BE DANGEROUS.
How do you know in this case the woman presented no danger or that the shooting wasn't justified?