People keep saying she brought her kids...THEY WERE NOT HER KIDS, it says it in the article.
Also, if the officer was between the open car door and the driver seat, it's very easy to see how he could have been ran over if they threw it in reverse. If he falls backwards and his legs go towards the vehicle then it's easy to imagine he would have been ran over. People keep saying "shoot the tires"...but if he was trying to apprehend the driver and she puts the car in reverse, there's a likely chance he could have fallen underneath the car itself (being struck from the open door and the car's momentum would easily cause a fall). It's unlikely he was aiming to kill the passenger of the car.
It was an unwise decision to run from an armed officer when they clearly presented themselves as such (also assaulting him), especially since one of the two other women knew their kids were in the car (who was watching the kids?). I like how the mother brings up the kids in the car and the shooting, but fails to acknowledge the three women stealing and potentially putting the kids in danger with their actions (and totally ignores that her daughter had been caught prior to this at a different Wal Mart and been banned from all stores).
With that being said, it's tragic that a minor accident ended with a life taken. Both sides should have used better judgement. Personally, the officer should not have had a gun in the first place. (then again, I don't know the area and the danger he would be put in without a firearm)