For me, that sense of being on high alert is less to do with airport security and more to do with feeling that nearly everyone and everything you interact with is some sort of low level scam. Overpriced food and drink, duty free, poor value upsells, the sea of manipulative advertising, plain old pickpockets, someone trying to sell you tickets for a chance to win a car, someone approaching you in a queue to do a “survey”…
It’s like browsing a Fandom site but in real life.