If this isn't the answer, and I'm not asserting it is or isn't. What is, and how do implement it. Or do you suggest if we scrap it all and go back to 1950's like airport security that the few incidents that are inevitable are an acceptable risk? I don't know the answer, but I'd like to have the conversation.
I should also say that I remember even in the 1970s being able to walk to the gate without a ticket (albeit after passing through a metal detector). Both that and the Iceland experience had the romance of air travel which is lost during the humiliation of large airport screening procedures in the U.S.