At the moment it is actually privatized prisons that both "mooch of the government" and profit from the slave labor provided by prisoners.
I'm unsure what I think of private prisons, but government prisons take money from the taxpayer as well, so prisoners need to do labor to pay for their living expenses and to pay for the harm they caused to others.
Funny I think you just described CEOs, land lords and bankers here too.
The CEO gets funded through their company. The land lord gets funded by the people he helps out by giving them a place to live. Taking away his house without compensation to give it to the poor is unconstitutional and ruins the whole point of buying multiple homes.
What debt? I don't care about fair. I don't care if they "pay for what they did". I just want to prevent future crime and our current system does the opposite.
All of the following must be considered for punishments:
1) Deterrance/preventing crimes from happening again.
2) Making prisoners pay for what they did in a proportional.
3) Not being a burden to the state
Caring solely about #1 leads to very harsh punishments. For example, if you make the punishment for drunk driving death, you would be preventing future crime. Yet this is a bad idea because it violates bullet points #2. Stricter punishments tend to lead to less crime for the same reason that high prices lead to less purchesing; when the penalty for buying an IPAD is $1000 instead of $500, you will have less people that do it. When the punishment for murder is death instead of a free college degree, you will get less of it, when you make the punishment for drunk driving death instead of a jail sentence, you get less drunk driving. However, the rights of the defendent must be weighed in addition to fairness, therefore we can't execute people for drunk driving, but murder is a crime worthy of the death penalty since it is a proportional sentence. Some places do tougher than proportional sentences (like Saudi Arabia executing people for gay sex), and other places do less than proportional punishments (most EU countries and about half of US states). I advocate for proportional punishments as a principle and slightly tougher than proportional punishment to save money. This means executing murderers and rapists, but not giving the death penalty for any other crime.
I don't care I don't care and we have laws against cruel and unusual punishment which I believe slavery qualifies for.
Whether or not slavery counts as cruel and unusual is entirely subjective, however I don't believe it is cruel and unusual. I don't want murderers living off the taxpayer while contributing nothing back to others. If they did contribute to others, this takes a job away from somebody else, and given that they are murderers, I would support the death penalty for them.