It is unfortunate yes, and also a strong indicator of working conditions in those countries. If they can make more and live better elsewhere, I don't see a problem with them leaving.
One point I'd make, is that if they are given scholarships, or their nursing education subsidized by the government, they should have to stay and practice a few years, before being allowed to emigrate.
Andrew Lopez, RN
http://www.4nursingstudents.com