The forum is no longer a nice place. It has become nothing more than a wall of complaints and has been for long time. I suspect at any given time there is only one or two posts on front page that aren't complaints.
Behavior can be modified through conditioning. Pavlov proved this a long time ago. I would suggest that you and other Mods spend about a month fully monitoring forum and just delete every complaint thread as they pop up. It will take some focus and dedication but could turn things around.
Don't respond to thread just delete it as soon as it's posted. People will eventually realize this isn't a complaint department and leave, or modify the nature of their posts.
Good luck.
EM.