It's called single issue posting, and lots of people do it. It is largely an exercise in self aggrandisement, a sort of "Look at me aren't I clever" sort of post.
It's mostly done by people with time on their hands, or a grudge in their heart, and certain people get away with it and others get 'rubbed out'. If your face fits or people are scared of you, then you can do largely what you like, other wise learn to do Blickies .