At some point fiscal sanity has to be a priority. It is unreasonable to adhere to previous agreements in the face of insolvency or unsustainable fiscal demands being placed on taxpayers. Just because the agreements were made does not mean that they cannot be broken.
I find it ironic that people argue that it is more beneficial to reduce the public benefit to the greater masses of society, to education, to cutting services rather then renegotiating the pension benefits.
I guess to some people the well of taxpayer money is endless.