The screws have brought all the revenge attacks on themselves. Most prisoners that have done some nasty damage in the system have come through the young offenders, where that was just a breeding ground for hatred from the screws point of view. They were famous for bullying and battering young, defenceless boys to the point of death, in some cases.

...It's appalling to remember that the entire Oxford University Library was sold for scrap in the mid-1500s. Nor was that situation unique to Oxford, as libraries were deconstructed throughout the land.