Lets be clear, a lot of this selling is about the possibility that interest rates will rise in the US. On the other hand it seems like foreign investors might be getting tired of lending the US money that will be used to spy on them. If NSA actions cause interest rates to spike it will make the damage the tech industry is taking look like a walk in the park.
Once again, the national security apparatus seems incapable of predicting or appreciating the consequences of its actions. The national security state continues to prove itself the largest threat to national security that we now face.