If we found out that the victim had been armed, legally or not, would that change things?
If the attacker had said to his wife, prior to the attack, "I'm gonna punch that M---- F-----'s lights out", would that make a difference?
If he truly felt that popcorn in his face was an assault then he could have done what as an officer he probably advised hundreds of people to do — get his name, go tell management, get his license number, file a police report, sue him in a court of law — and get laughed out of court.
If he truly felt that the guy was about to lose it and punch him or pull out a gun and shoot him, then he should have quit throwing gasoline on the fire stoking the flames. He should have put his big fat ass back down in his seat or moved to another seat.
100 empty seats and he chooses to sit right behind the 6’4” guy who was texting. Since when do you sit in the seat right behind the the tall guy blocking the screen — unless you did it because you saw him texting and wanted to pick a fight with him to exert your “authority”.
If quickdraw was really paranoid and felt threatened, he could have, as a last resort, sat his ass down and shut up and taken his gun out and put it on his lap just in case.
There were a whole lot of steps he could have taken between popcorn and deadly force.
Since you are unable to see that, I would suggest that if you carry that you put your gun away for awhile in a drawer and leave it there until you can come to grips with where Curtis Reeves was wrong.