Chuck, the castle doctrine prevents any future lawsuits by the family's. Since this appears to be a justified shooting as the man's life was in imminent danger he has 2 options, 1 to protect himself, 2 to most likely die, it was up to the assailants if he was going to live and it can't go down like that. This man showed great restraint trying to do as he was told and used deadly force as a last resort.
My personal feeling is if business's would stay neutral on legal conceal carry with their employees then they can very easily state that they do not feel they should take away anybody's second amendment rights. My personal feeling as a business owner is if the state and feds say it's ok for a man to conceal carry a gun then who am I to say it's not. If there is a company policy no guns, I wonder if a lawsuit may be able to be filed against Pizza Hut for it's employees actions.... Not sure, but if these crooks know we can't be armed while on the time clock it's pretty easy for them to pick the places to rob for minimal fear of them meeting their maker.
Bottom line is cudos to the man who protected his life and a message was carried out to the scumbag who got away. He should be thankful he's alive. Now he knows how his prey felt, although the prey doesn't have the flee option in most cases like he did.