Suggest you read the announcement at the top of the page....but I'll put it here again for you.
Notice regarding post responsibility and anonymity
NOTICE: You are responsible for the content you post. This is a public forum. Treat it as if you are speaking in a crowded room. Recent high-profile defamation events illustrate that there are ways in which third parties can force personal data, including contents of personal messages, to be released by bulletin board owners. Be careful - libelous/defamatory posts can and have landed members in legal hot water. PPRuNe will not guarantee your anonymity in such situations.
If you want "free speech" you are of course welcome to start your own forum and set your own rules!