Don't be ridiculous. The valuation of the unfunded liabilities on the books of states and their political subdivisions related to pensions is a GASB accounting standard, not "right wing propaganda."
You reveal how little you've thought about the actual finance involved in these things. Just acknowledging what the unfunded net pension and OPEB liabilities literally mean (as required by GASB 68 and 75, respectively), we should be able to understand the gravity of this problem. And this problem assumes rates of return that are not supported by observed long-term actual rates of return. So even when we fudge the assumed ROR with irresponsibly optimistic hopes for ongoing stock market returns, we still have this scenario in which a dozen states or more have a pension forecast that is bleak as hell.
"The State backs it, therefore it's rock solid!" is an absolutely hilarious knee-slapper of a comment, it would be funny to see the reaction if you were to say it at the podium of a GFOA conference.
The fact that law does not provide states a means to declare bankruptcy does not mean states can't destroy themselves economically by being forced to crush their tax base to meet their debt service (pensions are a form of debt service, as pension liabilities are LTD). Short of vast pension law reforms, Kentucky and Illinois, for example, will have to significantly increase the cost to taxpayers for their pensions in the near-term, while Wisconsin and South Dakota will not. This dials up the incentive for people and companies with money (from whom those governments will have to try to extract revenue) to flee those states. An exodus from a state that is desperately having to raise taxes to meet its debt service obligations exponentially magnifies the problem. It's a death spiral. It can happen to any government that 1) can issue long-term debt but 2) cannot print its own fiat currency.
It would be one thing if all states had a pension funded ratio of (x)%, because then we'd all be in the same boat. It would still be extremely difficult to develop an agreeable solution about what to do about it, but at least there would not be the potential for entire states to circle the drain.