Respectfully, I don't think anyone is suggesting that giving up and letting yourself get killed would be a good option. But it's a whole different question just how much an average Joe could do to help in that sort of situation.

A shootout in a crowded theater, mall, wherever? I don't know about everyone's training and background, but I doubt we have that many SAS and Navy SEALs here either.

Are you really capable of taking headshots at 50 feet under extreme stress? When was the last time you've done that before? Can you really guarantee that your response won't endanger an innocent bystander?

YMMV but I reserve the right to my doubts.

Anyway, I don't think this sort of discussion does much good. Lots of places online for armchair commandos already, no need for that on ETS.