question the falling sp, page-104

You neglected to mention the possibility that one or more of these incessant posters are ex-employees or people previously connected to the organisation in some way.

As you highlight, why would anyone in their right mind exert so much time and energy on a stock that they have no financial interest in?

You are 100% correct. It makes no sense whatsoever. Unless of course one of the above is on the mark.