@Walter Hinteler,
Sometimes these names are thrown out there, I forget what they are reference to. Rather than asking and getting lines like, it has been discussed...I looked up "Quantum" and "Snowden." Having done so, from what I can see real quick like, there with this particular method, industrial spying has not been "proven" by the Snowden leaks, could have just as well have been for security reasons as stated by US. Don't make it right.
I don't think anyone seriously thinks the government of Germany is in league with terrorist, but it is not outside the realms of possibilities that perhaps those who happen to be in a government capacity in some way have some kind of terrorist connections.
Perhaps because from what you have been saying, Germans are extra sensitive on spying and privacy issues, and rather than dealing with it, US intelligence just went around it. Again not excusing it and it looks like once again, we got caught.