it really does come down to the legalities of it all
if grandpa used his legal 1970's auto to mow down multiple home invaders in his kitchen he would be cleared after it was determined it was a home invasion and self defense. I don't care if he took out 3-4 felons with a tommy gun.
just my opinion and a thumbs up to the OP's thread starter.
"Damn the torpedoes, full speed ahead!" -Admiral Farragut @ Battle of Mobile Bay 05AUG1864