So in the future when someone asks a question re 'those who shall not be named', and you have to delete or deny the thread topic, that denial or deletion doesn't then tell a story? Don't envy the position this has put you in, but agree you have to act or have legal action taken.
Sad that any vendor would see this as a good course of action. Maybe a more positive/proactive action would have been to support the threads and respond to the questions or queries. this is what I see on many 4wd forums, and while the vendor may not like seeing the feedback, they have generally acted professionally and replied/responded as best they could.