It's not just former employees that will suffer. Everyone suffers when states have to pay higher interest rates on their bonds because of poor credit ratings (that's what bankruptcy does to a state) or have to pay more for workers and contractors. Everyone will have to pay higher taxes and everyone will receive less from the government.
I cannot understand the logic of not making good on government obligations. You can take the position that the government should stop promising pensions, but how can anyone think it is a good idea for the government to fail to pay for the pensions it already promised people (or, frankly, any other promise the government made)?