Former senator David Boren writes in his book, Letter to America, that not only does this happen, it's actually a good thing for the United States because many

Former senator David Boren writes in his book, Letter to America, that not only does this happen, it's actually a good thing for the United States because many of these US-educated folks go on to become leaders back home. So if anything, their return to their home countries only solidifies American strength. For the time being, at least.