The Society of Homepaths are one group who have utterly failed to learn this lesson. David Colquhuon (himself no stranger to receiving legal letters) reports on the Society of Homeopaths attempt at bullying:
Many people now have written about the disgraceful and dangerous claims by homeopaths to be able to prevent and cure malaria. My contribution was “Homeopathic 'cures' for malaria: a wicked scam”You can read the original article here: The Gentle Art of Homeopathic Killing.
One of the best contributions was on the Quackometer blog, The Gentle Art of Homeopathic Killing.
But the post has vanished! Quackometer’s ISP has received threatening letters sent by lawyers on behalf of the Society of Homeopaths, who claim that the truth i.e. [sic] defamatory, while being unwilling to say which statements are wrong. These threats have forced the removal of the post (for the moment), though you can still read it from the Google cache. And a lot of other places too.