So because they are footing part of the bill they might as well just foot the whole thing? non sequitur much?
If anything we should be charging prisoners the full cost of their incarceration but in that case even if we paid them minimum wage it wouldn't cover their debt, not by a long shot. At least then people wouldn't falsely equate modern prison systems with slavery, but the imprisoned would be much worse off.
They are paying for the whole thing! Do you think private prisons raise money for donations to pay for prisoners to subsidize the public out of the good of their heart?
Are you assuming that prisoners deserve to be slaves and that their labor should be free?
For that matter we should get rid of public police and fire departments. If someone wants that service they can pay for it themselves.
/s
What did I say that at all disagreed with prisons being a public service? No shit.
The innocent public is already paying for it. They're just paying for profits, too...