Reuven – there are many conditions necessary in order for loshon hora to be permitted according to halacha. Those conditions are not in place here. I explained some of this in my above post. I also listed some of the conditions of Loshon Hora l’toeles in my Loshon Hora thread, although I don’t think I ever finished, and I do hope to do so when I have a chance.
Hashem is not going to ask me why I wrote my above post. If I hadn’t written it, He would ask me why I didn’t. The halacha is that if you hear someone speaking Loshon Hora and you don’t say something, you are oiver on an aveira. What answer will you have when you are asked why you didn’t say anything?