What happens if you don't show ID to the airport Stazi? No idea, they are still writing the freaking laws according the police who are .. working on this
Overall it's pretty painless in Australia, the States are much more authoritarian about it. Some years ago now I was doing an extended charter run in the U.S.rather wealthy family and the wife seemed to have packed her entire wardrobe. At every single airport they went completely through her bags - interesting mix of lingerie and other bedroom stuff she had ;)
China is probably the worst I've experienced, guilty until proven innocent attitude.
The point is we're becoming an America which itself is becoming something more sinister.
China, the communist party are a bunch of people acting like their imperial selves of the past.