Yeah, that, ye olde brain drain.
The myth that it's these starving oppressed victims coming here is contradicted by the fact that they had the means (which includes money) and motivation to leave. Greed is the main inspiration, and those left behind are the truly poor, the ones stuck, the ones who won't budge because they might be shot before they leave town.
Saw on the news today about the first DACA kid to get a Rhodes Scholarship. His family fled violence in Columbia. Ok, but the US is the only place they could get to that's safe?
I do feel most sorry for a kid raised here, to go back would be to a foreign country.
But if I had to go, it'd be to Canada because it's next door and the most like us. Surely on the trek here they must have noticed that Costa Rica is friggin awesome, and they speak the same language.
Ever see that movie, "El Norte"? It's about all this, and has a funny bit about "chingar"