glad you survived your ordeal...however,,,,,
i understand your family was in the vehicle but there would have been a controlled accident i am afraid w/the aggressor taking the majority of the damage...
1) this precluded the idiot from leaving!
2) this would have precluded some other family from enduring the same fate
(before everyone gets jumping up and down...since the OP stopped his vehicle w/o a defensive capability within his grasp his family is in the more danger from dying from the aggressor's hand verses a controlled accident where the OP crashed into the aggressor!!)
right on about not having a firearm!!