Free speech is threatened when corrupt forces can pressure the means of distributing speech. Corrupt governments all over the world, or corrupt elements within governments, use the methods at their disposal to silence uncomfortable speech. One of the main methods they use is to threaten the source of speech.
Anonymous speech is important, even for more mundane reasons than scathing political criticism. Advocates of medical marijuana, proponents of evolution, gay rights activists, critics of local police, and many others may need the protection of anonymous speech to protect themselves while they voice their opinion. Efforts to censor online speech are doomed to fail because people will find ways to publish unflattering material online without leaving any trace of identity behind.
Info for those who need an anonymous website. http://live-free-in-an-unfree-world.com