BBC 1 The Prisoners - From Danielle

Post edited with permission off the writer 

Dear Prisoners Families Voices. I did watch The Prisoners on BBC 1 but I am not too sure where they are going with it. The majority of the general public are of the mind set - lock criminals up and throw away the key!
What are these documentaries trying to achieve exactly? They will not prevent crime and they certainly won't stop people from going in to prison. Are documentaries as such constructive or just sheer exploitation?