It's true that it is often more difficult for immigrants to find good opportunities, even when they have high qualification in their home country. And the reason for why people wouldn't want to admit that they bet on the wrong horse is pretty obvious. Imagine selling out your home country and thinking that the westerners are superior, then finding out that none of it is true. It's a pretty embarrassing thing to admit. Saving face is particularly important in Asian cultures https://en.wikipedia.org/wiki/Face_(sociological_concept)