https://www.youtube.com/watch?v=LZD2pBeXY6Q
I have to say, drawing a rather sweeping conclusion of a nation of 51 million after a month long visit to a small area (albeit much of the nation's population living there) is maybe worth some reconsideration.
It's like spending a month in Hollywood for a month eating out often, and concluding that every waiter/waitress in US is just working odd jobs while trying to break into the entertainment industry.
Edit: I've also met people who are well off enough that they don't have to work as waiter/waitress, but still moved to LA to get a script made into movie, go to usc for movie (like writing movie script) etc etc.
I'd think unmarried children living with parents until they marry or get a job that requires moving to another city is quite natural in most other countries.