I skimmed to the meat of the post so I totally missed the 10 years so that's my fault, but like I said, everyone else had already eviscerated OP so I figured I'd try to at least give some helpful advice for the future. You're right though, after 10 years this should have been known.

I know everyone has already eviscerated you here so I won't beat a dead horse. If you have a good manager/supervisor that goes to bat for you and actually tried to raise your stock, you return the favor. NEVER complain to someone above them, behind their back. Sure it may have resulted in that person being terminated, but think of the other people you have to work with who will also have to shoulder more work and who in turn, lost a manager that they may have had a similar experience or relationship with. It just paints you in a bad light and also puts a target on your back for next on the chopping block. Don't trust anyone especially in an office or corporate type job, and if you do happen to find someone trustworthy that you can confide in, don't stab them in the back. Do your job as best you can, keep your mouth shut, and let things play out how they naturally would, don't add to the problem.