Based on the "edited" video that we see, it's justified.
Cop pulls lady over for doing 71 in 55. Asks her to turn off vehicle while he walks back to his vehicle. Woman speeds off from that point. Cop chases her down and gets her pulled over again. Woman is going bat shit insane in yelling at the cop. Of course is cop is yelling at her, but giving her lawful orders especially in light of the fact she just fled from an officer moments ago. Cop asks woman to stand at the back side of the vehicle so she is in plain view while he goes back to his car. She instead rushes back into her vehicle forcing him to chase her. Then her teenage son exits the van to assault the officer. First officer brings out his taser to stop the boy and chases him around to side door. Boy locks the door as other police are arriving and witnessed the scene of the first officer being attacked and then chasing the boy back into the van. First officer tries to break window in to get at the family inside. Van starts to speed off as a third officer appears at the scene. Third officer is unaware of the occupants in the van, only that they assaulted a fellow officer and are now speeding off to resist arrest.
Cops can use up to deadly force in that instant. You DO NOT FLEE FROM OFFICERS AFTER PERFORMING A CRIME. Third officer fires, but it is clear he is shooting out the tires as the van flees. The video shows a tire was hit while being shot and later when the police catch up to the van the back left tire is flat.
All I can say from the editted video is that the shooting by the third officer at the van was indeed justified. I cannot believe that anyone could at all defend that woman. She is a complete idiot. And she basically used her younger children as a human shield. No different than a criminal taking a child as a hostage. She and her teenage son need to be behind bars for their actions for a very long time.
Can't they just follow her? Not enough crime to shoot a family. Why not just get back in the car and pursuit again. Now she has 4 violations on her. Just keep adding that violations and call a backup. Its establish the mom is nuts but do you shoot a crazy person because they are crazy. People do crazy things if they have to pay a fine.