Not only are these systems a violation of privacy and a failure to maintain a democratic atmosphere, they also cause much paranoia and require too much effort to both maintain the functionality of, but also to protect the secrecy of.
It is not necessary to spy on American citizens to prevent terror acts. Nor is censorship of criticism towards the government appreciated by the users who like the concept of a free and open Internet, not to mention the fact that it does not appear very "democratic."