There are no doubt many schemes, most of them structured with 'creative accounting' as imaginative as necessary for the corporations to avoid their obligations. This is done so the current officers and directors can show the stockholders bogus current 'profits' and thereby justify huge salaries, bonuses and perqs for themselves. The stockholders are co-conspirators by default, since the scam is not possible without their participation.
Now since legislation like Sarbanes-Oxley has effectively stopped the ability of corporate execs to lie about assets and earnings, they're looking for ways to cut costs to boost the bottom line. Unfunded pension obligations are an easy target, apparently.
OK, let's assume for a second that you have a company with an unwavering moral compass, that says we are going to pay the pensions no matter what, and you have stockholders that will go along with. For various external reasons, you have less revenue coming in than you have going out. You are still going to run out of money before everyone gets paid. So is it better to bankrupt the company and pay a few more people? And what of the companies that were their suppliers who are now going to face the same problem? Can a line be drawn, and if so where?
If those 'futures obligations' were funded, and tied to or invested in the overall stock market, retired employees would have been easily 'sustained'. Instead, those empty promises were in many cases never funded, and the ones that were funded were invested in some pet scheme or risky venture close to the pockets of those who directed the funds. Out and out larceny, in my book.
I can't argue with that point. But that's where the employees and the unions are culpable to some extent. They didn't spell out the nature of the investments and then follow up to see that they were adhered to when they voted on the contract.
First, a bet is by definition, optional. Social Security is not optional; you pay into the system from all earned income. Second, the SS system has never defaulted on its obligation to pay benefits; the risk is effectively zero.
Payment into the system is mandatory. Not investing your money elsewhere as a hedge, and then allowing yourself to become dependent on SS is optional.
SS has not defaulted, because unlike corporations, the federal government can spend more than it takes in as tax revenue, and increase revenue by raising taxes. Would you really want companies to engage in that same practice? The CEO and shareholders (equivalent to POTUS and Congress) decide to fund the shortfall by increasing the amount you pay into the pension?