It is if they’re attempting to hit you with a car.
...but not after the car is stopped.
I think that the rules of engagement (anywhere) are that if someone uses a car as a weapon, the gloves are off. You stop the car, immediately, because OTHERS are now in danger. This involves disabling the car (iffy) or shooting the driver (definitely).
Shoot the tires out, use spike strips, use a “pin maneuver” with your cop car. Push her up to a barricade, make sure she can’t drive away.
Cops are too trigger happy.
Good thing she didn’t have a dog in the car, they would’ve shot that too.