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As mentioned several times in your post, all we can do is speculate as to what the program enatails and how it has been used. In a functioning democracy, this would be unthinkable, but of course we haven't had a functioning democracy for quite awhile.
My point is that the controversy exists completely independently of how anyone feels about aggressive eavesdropping and data mining. The overuse of the word "enemies" in the debates that have taken place and that will inevetably follow. Point to the actual problem. WHO is the enemy. I've cited GreenPeace and PETA in the past as organizations that certainly have justification to be worried.
In all this...where are the journalists?