The roots of the culture of torture in the US prison system are pretty much an open secret. As Leonard Cohen says, "everybody knows." We all know it is not just spontaneous prisoner on prisoner violence. We all know that it's not about justice.
Now everybody can see too, courtesy of BBC 4, which has a documentary on line about US prison guards torturing prisoners (via Lenin's Tomb).
We all know. But it is so much worse than you think.