With all due respect, my initial comment was intended as total sarcasm, Jim.
OF COURSE he can't a claim a "self defense" stand - regardless of what transpired previously, (on the road, during the "cutting off" episodes), the end result was that this fellow used a firearm to purposely try to kill the driver, firing while following, apparent from the bullet hole in the back window of the victim'e truck. The driver was not hit , because his daughter's skull got in the way of the bullet's trajectory.
My intent re posting this - why did this person have a firearm in the vehicle in the first place ? Most people would agree, even if he was a "licenced carrier", he went way overboard by using his weapon during an obvious road rage incident. It's true - "guns don't kill, people kill". But if this person didn't have a gun, this 4-yr. old would still be alive.
Opinions???