As I said, if the place is so damn great, why would anyone want to leave? Doesn't matter if they are citizens or not. If they come to the United States in droves, then the island is not that great a place to live and work.
lol. I can’t read minds so no, I don’t know what you mean, I only know what you say.
They leave because they can and do so if it appeals to them for whatever reason. Same as any free person.