People often ask me what I mean when I talk about erosion of borders. Syed Farook and Tashfeen Malik are a great example. Islamic State got at them without anybody really needing to cross borders. It can just as easily get at somebody who never left the US at all.
Those Russian guys who were in ISIS’S gruesome head-chopping scene I told you about pledged allegiance to Islamic State before leaving Russia. And no borders stopped them from getting there, first psychologically, and then physically.
Indoctrination happens in a space where national borders are irrelevant, and there’s nothing anybody can do about this.