I also probably don't think that the emigration hurts their home countries as much as you do, they usually support their whole families back home and don't forget about them entirely.
In the Australian experience they bring their families with them, and when they get old they retire to their home country on an Australian pension. We take doctors, surgeons, bankers, business people, the rich, almost no middle class and only asylum seekers from the lower class. Very little money goes back home and when they return home, if they do, it is to retire and not work usually.
Remittances (expats sending money home) are a huge part of the Mexican economy
It is a huge part of the Philippine economy too, and I am sure there are others. It is the least desirable way to add wealth to a nation. Spain collapsed economically because of its wealth not being based on local products when the wealth from the new world dried up. Sending money home makes it worse not better in the long run.
I think it is far better to say stay where you are we will bring the jobs to you.
As a somewhat contradictory footnote we recently had a clothing manufacturer bring their industry back to Oz because the lead times in China were way too long. Here with a modern technologically minded society it could change design and produce goods quick enough to take advantage of short notice changes in the market...eg an unannounced visit by a pop star resulting in a demand for printed t'shirts.