The decision to punch the young woman came from within the officer. His sin nature. His desire to hit her.
You keep trying to blame the victim of his blow for his decision to hit her.
The victim is not responsible for the behavior of the assailant. The assailant is responsible for the behavior of the assailant. Period.
Would you rather have a full scale riot caused by one mouthing off woman who wouldn't stop or whack her across the face and haul her off to jail and end it right there. Your choice.