If they could cover their liabilities with their assets then they would sell the assets to do so. Clearly the assets do not cover the liabilities. It's not a lengthy process to sell a bond on the open market
If you bought them at 2-3% yields then you lost a lot of money, which is probably the case here. If they bought below par they would get their money back at maturity, but that could be 20-30 years from now. Despite being "safe" from a credit perspective, munis are not safe from interest rate risk
Sorry, you're right that their assets are also down. I didn't mean to deny that. It just seems that it was more a liquidity crunch than a solvency crunch. But maybe they cannot pay all their debtors?
