To clarify, you feel it is better if untrained personnel wait for the cavalry?
If there's a reasonable expectation of trained help arriving in a reasonable amount of time - yes - I believe that's the prudent course of action.
My hat's off to the woman that yelled at the would be abductor and scared him off.
My son ran to the aid of a woman and her child that were in a car with a downed power line on top of it.
Matter of fact,,,,during his little speech that he gave to his National Guard unit when he was presented an award for it, he credited my wife and I for instilling that type of value in him.
Neither story, inspirational as they are, have zip to do with discharging a weapon in a crowded public place where trained people are present and in the process of responding...