I don't match the stereotype (I just moved from a culture that ruthlessly exploits the honest to one that at least lets them live a tranquil life), but I do agree that phenomena like that do exist.

Something like 40% of my high-school classmates have moved to another city or country, for one reason or another, and the ones who've remained seem to have become somewhat hyper-localistic, almost as a reflex or justification for not doing the same.

I don't know what the answer is, but I don't think forcing me or others to stick around would have made much of a difference beyond generating even more social resentment.