I don't know about recidivism rates, but denying access to a parental with tyrannical phone rates and doing damage to a child I will stand against.
The keyword here is "families". There are a bunch of reality shows on dealing with prisons that do NOT focus on the harm done to children.
To a small child, just hearing their mom or dad tell them they love them on a regular basis, even if they don't really understand why that parent isn't with them, will work miracles.
You have got to the core of the issue. Burdening communications between those incarcerated and their families with excessive telephone charges is contrary to humane principles and the public interest. Defending family values must include consideration for families impaired by jail or prison.
I have listened to many of these calls, and if you think that is what is going on on the phone, you would be appalled at reality. There are the many times these children would be better off not talking to their friends and family.