Too many people it seems have forgotten the lessons of Kent State and the 68 democratic convention. Violent action against citizens over their politics is a real possibility, if we can't maintain the rule of law.
Quoting from your post yesterday "the Administration has now baldly stated that whatever it is allowed to do against our enemies in a war, it is equally entitled to exercise all of the same powers against American citizens on American soil."
So what happens when the eavesdropping program discovers someone who's a really bad guy but they can't prosecute him because they've tainted the evidence?
We already know what they do if he happens to be in Pakistan.