Americans interactions with authorities rely on their consciousness of Constitutional protections, and they have accepted that in airports there is no US Constitution.
Test feeling of high vulnerability and insecurity felt there, and the awareness of the means the authorities there have at their disposal to coerce 'cooperation'.
I believe this is correct, but at the airport you're really faced with the reality of the situation. Everywhere else, the same mechanisms exist 'under the sheets', but there's a thin veneer of society pasted over the machine.
One, not a US thing. Two, the US Constitution is, despite the hyperbole.
Ignorance is bliss. Americans know because we can access our US court decisions, unlike any other country in the world. (Thanks be to CourtListener and other predecessors.) The "North Koreans have more rights, look it's right there in black letter law" is laughable, despite being repeated nonstop by cough some sectors of society cough since Soviet times.
I don't suppose you've actually, you know, read the constitution? If so, I'd be fascinated to hear about which parts pertain to, or don't apply at airports that should?
The main thing people seem to find difficult to comprehend is that planes owned by airlines are the private property of the airline. You're pretty much welcome to buy your own plane, and use it to carry anyone and anything you want, but if you want to get on someone else's airplane, no so much.
Sure, planes are private property. The airport is not. Airports are government property. And when I'm, for example, going through TSA, I'm not doing so on a plane, but rather in the airport.