Of course they are, and that IS the crux of the problem. By not contributing anything to pension and or health care, or a bare minimum, all of the burden falls on the tax payers in the case of public employees. No one can have it both ways anymore, it cannot be sustained. Econ 101.
Look at the auto industry pensions. a figure I recall is it takes $7000.00 per car just to try to meet current obligations. How in the world can a payout like that continue and still allow cars and trucks to be within reach of the average individual. Public pensions are no different other than the tax payers are the ones footing the bill and have no choice in doing so.