It's wrong to threaten to hurt someone for any reason.
Alex is in his car at a red light when Quincy, coming up from behind, rear ends his car, hard.
Alex wants to show Quincy his displeasure.
Alex gets out of the car and calmly tells Quincy that his driving was awful and his insurance will have to pay for everything.
Alex gets out of the car and screams at Quincy telling him he's going to kill him.
Quincy is remorseful and knows he's about to get a huge increase in insurance because of his mistake.
Quincy is terrified and locks himself in his car before clumsily attempting to back up and drive away, almost killing a bystander.