Can't really judge the facts from the liberal press account, but I don't think the castle docrine is going to help a guy who shot someone that was still in his car.
A car is a deadly weapon.
His dad should shut his trap.
Re: Liability and politics
A quick glance at LAPD’s use-of-force policy:
SHOOTING AT A MOVING VEHICLE. Firearms shall not be discharged at a moving vehicle unless a person in the vehicle is immediately threatening the officer or another person with deadly force by means other than the vehicle. For the purposes of this Section, the moving vehicle itself shall not presumptively constitute a threat that justifies an officer's use of deadly force. An officer threatened by an oncoming vehicle shall move out of its path instead of discharging a firearm at it or any of its occupants.