My point it that the only purpose of the "security theater" is to serve as a psychological tool. There is no real need to improve security apart from strengthening the cockpit doors, because the the risk is low enough as it is, and the ROI on any other measure is almost guaranteed to be zero.
Yes, it is mostly psychological (which is an important component too). However, the danger is real. An airport is a place of concentration of people and goods. A terrorist act or a similar attack in an airport could be very costly. Besides, dangerous stuff can conceivably be transmitted long-distance via airplanes (cargo or passenger).
Another such place of concentration is a port, especially seaports are vulnerable. They are notoriously poorly protected.
Are you confusing danger and risk? Thousands of trucks transport really dangerous goods every day, but the risk of this activity is observably very small, the meltdown of the MacArthur maze in Oakland on 2007 notwithstanding.
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Another such place of concentration is a port, especially seaports are vulnerable. They are notoriously poorly protected.
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