Even in liberal states, the dehumanization of criminals is an endemic behavior, and we are reaching the point in our society where ironically having the leeway to discuss the humane treatment of even our worst criminals is becoming an issue that affects how we see ourselves as a society before we even have a framework to deal with the issue itself.
What one side wants is for prisons to be for rehabilitation and societal reintegration, for prisoners to have the right to decline to work and to be paid fair wages from their labor. They further want to remove for-profit prisons from the equation completely.
What the other side wants is the acknowledgement that prisons are not free, they are for punishment, and that prisoners have lost some of their rights for the duration of their incarceration and that they should be required to provide labor to offset the tax burden of their incarceration on the innocent people that have to pay for it. They also would like it if all prisons were for-profit as that would remove the burden from the tax payers and place all of the costs of incarceration onto the shoulders of the incarcerated.
Both sides have valid and reasonable wants from their vantage point while overlooking the valid and reasonable wants from the other side.