Because you'll get your ass whopped.
This has to be one of the strangest road rage videos that we've ever seen, and we've seen quite a few at CarBuzz. The driver in the Honda Accord violently attacks the biker and his passenger at a red light. It went 0-100 real quick as the driver punches the biker in the face, which isn't smart because bikers wear helmets. After throwing a few more punches and shoving the biker's passenger, the driver ends up getting slammed down. The guy must have been on something strong as he can't remember why he's mad and ends up passing out.
The biker did the proper thing and didn't fight back. Don't be like this asshole driver and learn to control your anger.