Prisoners know when they are being mistreated. The officers royally take the piss out of them and love seeing them damaged and abused. Weaker-willed lags kick off and perpetually add to their sentence but often know when to just roll into a ball and let the guards do whatever they like with them. They have all the tools and the power to humiliate this tough prisoner. Every day is a chance to dish out their sadistic fun.
See the video at Strip Search Hell