You have a point there; but in this letter, they told many things that needed to be told. Everyone won't read it, but some people (Freepers and other freep-minded people) will read it and we can quote and excerpt from it.
The parts about Kofi, the EU, Christiane Amanpour, and the NYT are particularly valuable as these are institutions and individuals who have received far too much respect and credibility from the uninitiated. Now they stand indicted by the victims of their criminal behavior. Next time you hear a liberal defend the UN, you can cut and paste what the Iranians had to say about it and e-mail it to him.