In a global world, what happens within one country can all too easily affect others. For example, refugees leaving Sudan can strain the stability of neighboring Chad.
此外也有实用主义的考虑。在全球化社会里，一个国家发生的事情很容易影响到其它国家。举个例子，逃离苏丹的难民会对邻国乍得的稳定构成威胁。