I understand your point - prisons want to exploit prisoners and their families for profit by brokering imports into their facilities.
I also think that many people who have bleeding hearts for these criminals and their families haven’t been direct victims of crimes themselves.
Often these criminals are terrible people who act horrifically and with malice but act so sorry for themselves when they’re caught and on trial. Their families usually only care for the criminal they’re related to and never to the victims no matter that the criminal did. I don’t see families of criminals giving money to the victim of the criminal, do you? Sometimes the families and cultural influence are factors that attribute to a criminal’s motivation to commit a crime.
Trust me, I’ve been there! Finding the balance of incentives not to commit crime is difficult because crimes are often committed by violent people who do not respond strongly to logical or legal reasoning but respond somewhat to force and fear. The key, I think, is providing people with resources and care far before they’re at the age where they usually commit crimes.
There’s also something to consider about the western and eastern views of individualism. An eastern view might consider this prisoner as a component of their family or their community.