Surely for the purposes of rehabilitation it would make much more sense to have inmates not mixing with other inmates and spending time confined alone to think. It is lack of thinking that leads most people to jail in the first place so if they had nothing much else to do but reflect on their past errors then they may find the isolation and boredom and (possible) regret then they might not make the same wrong turns so as not to go back. Prisons should be places where inmates don't get to socialise or joke or play computors and watch tv etc. What is the point in sending a thug to jail to chill out and make friends with other thugs to joke and pass the time til release at the taxpayers expense and achieving diddly squat because having been there once before they can carry on as usual in the knowledge that if they get caught and go back then its just like going to a kind of draconian holiday camp rather than serving their punishment!?