No more than we are certain that all pro-war groups are interested only in returning Democracy to Iraq, I can assure you.
As I said earlier, I'm not surprised or offended in the least by it, it would be foolish for a government not to monitor it's own dissent, ignoring it certainly won't change anything and can, when extreme elements are involved, be dangerous.
Personally, I can't see any situation where this kind of action wouldn't be required, but I suppose it depends to what level they are doing it. The example given is of a group of anti-war Quakers. Maybe these come under the blanket of religious extremists to the Pentagon, I'm not sure.