If I ever worked in management you might have a point. There have been hundreds of posts far beyond what you state. The posters most in violation don't seem to post here anymore if at all. Since pretty much every single thing they posted starting before contract 2012 turned out wrong perhaps they got tired of being wrong. It may also be their posts led to unwanted attention and they are no longer around.
It's nice the last year to start seeing a new breed of posters far more positive then the "we're doomed I just know it, were all going to die" crowd that dominated here so long. Witness the recent posts on the fired pilots.