Let’s say you’re the President of Dirtbagistan. You’re saddled with a surplus population that doesn’t work, filled with political agitators and radicals, criminal gangs, the sick, etc. To your east lies a relatively wealthy nation with lots of free space and a corrupted government.
Whatcha gonna do?
Easy. You’re going to jettison everyone you can, just like Castro did. They leave? Not your problem anymore. You don’t have to pay for them and even better, they won’t be voting in any of your elections anytime soon. Since they left voluntarily and are all pretty much camped out in one area of The Other Guy’s Country, it’s a three-fer!
1. Not your problem anymore.
2. Colonization via overwhelming numbers displacing the natives. Get enough guys there, you’re lookin’ at some new beach-front property!
3. Increased ethnic representation in The Other Guy’s Country gives you some influence in his government, which means they’ll pander to the invaders and make decisions that benefit you, personally.
Everyone who’s a productive member of Dirtbagistan isn’t going anywhere – they’ve already got a nice life. Engineers, doctors, lawyers, criminals (maybe the criminals, but only to expand their territory) – they don’t need to go anywhere. The cost of living in Dirtbagistan is so low, they live like kings anyways… to move to The Other Guy’s Country would only lower their standard of living. So, The Other Guy isn’t getting educated professionals.
Edit: Actually in retrospect, it’s a four-fer. Add to the list billions – with a “b” – of dollars siphoned out of The Other Guy’s Country and sent over to yours. Nice new source of income you can tax – indirectly of course – and fill your pockets with extorted money and pay off your cronies in order to stay in power….
The wicked flee when none pursueth..." - Proverbs 28:1