The “brain” is not a static concept. Trapped in Kinshasa, under appalling conditions, the brain will drain away in less time than it takes to get to New York.
况且，仅仅把人留住，即使成功了也对国家助益有限。“人才”并不是静态的概念。身处金沙萨压抑的环境中，人才流失会比让他们前往纽约更快。