There's no one central point that can be attacked to shut Gnutella down. According to Gnutella's web site, the distributed nature of the Gnutella network makes it indestructible. It could withstand a nuclear blast. If, say, New York was hit by Dr. Evil, GnutellaNet probably wouldn't even notice. The Web is home to a lot of sloppy thinking.
People tend to think that because the Web is distributed, it is ungovernable.
Because the technology isn't in place to regulate it today, it can never be regulated. The reality is that an organized, motivated government can easily crack down on the Internet. Step by step. In most nations, the laws are already in place. Copying data can be illegal, if the data consists of copyrighted programs, books, music, or movies.