AtticusMatlock said:
IMO prosecutors will try to argue that dad instigated the interaction by ramming the truck off the road, which could make any further claim of then using the gun in self defense or defense of others invalid. They will try to argue dad is the initial aggressor in the interaction and should have waited on police.
I'm with techno-ag, Fosler initiated the aggression by kidnapping the daughter. Everything the dad did was in defense of his daughter.