"Prism is an attack on American citizens" -Chomsky
EDIT: I suppose he phrased it this way so that we listen more closely (or listen at all).
But also, it is American elected officials who deployed the program on American taxpayers money. Therefore, American citizens, unknowing to themselves, have become a major investor into the greatest surveillance network in history, which spies back on them and the rest of the world.
So Chomsky's quote hit it right home.