The shooter, and manager, behaved recklessly in persuing a situation that neither of them had any business persuing. Let the dirtbag get away with $5 in meat, call the cops, fill out a statement, go on with life.
This is your opinion and I would guess you have never been in a situation like the store manager and good guy were in. If no one attempts to stop the BG crime will continue to increase and you will not be able
go on with life locked in you house and afraid to go out in public. Believe it or not we have many places in America where very large portions of the cities are controlled by the bad guys. How did this happen? The residents did not fight back.....Today you can read stories about "Night Out On Crime", "Crime Watch", and "COP (Citizens on patrol)" where the residents and business owners are attempting to take their neighborhoods back from the BG's. The City of Riviera Beach Florida has started such programs in an attempt to take back their city from the BG's. The state has a "Gang Task Force" that has greatly reduced gang related crime and in time will stamp out all gang crimes.
Store robberies , home invasions and muggings have been greatly reduced in my state, Florida, after new laws were recently enacted allowing people to use deadly force to protect themselves and their property.
IMO, people with attitudes such as yours sends the wrong message to the bad guys. It is a proven fact in my area that the convenience stores that made no effort to stop shop lifting and grab and run crime, other than calling the police, were robbed more often. The stores that did stop or attempt to stop the BG's experienced fewer robberies. One store has had no attempts in the last 6 or 7 months since the shop owner shot and wounded a robber.
Home invasions were on the increase in all neighborhoods until the Castle Law was approved allowing you the right to defend yourself, family and property with deadly force. Home invasions are now seldom committed other than by gangs against other gangs.
I have had the experience of being robbed by an armed gunman and if I had not fought back I am sure I would have been killed. I have carried a CCW ever since.