Pensions funds have been hugely manipulated and used to distort true earnings for years. Just another reason to be short GM in my opinion. Like the fictions of "pro-forma earnings", the mythical earnings in each earnings report purported to be from pensions are pure garbage and nothing but air.
A solution for all of this would be for the companies to have to pay their taxes based on what is reported to the public as earnings - if they want to use "pro-forma" or "EBITDA" earnings to convince shareholders that they are doing well, then pay taxes on that figure rather than the true earnings. It would not take long for the fraudulent ones to go out of business.