Evil never identifies its true motives. It always has excuses to hide its intentions. When prisons began replacing solitary confinement with Total Restraint, which involved putting dangerous prisoners in extreme bondage but keeping them housed with the general population, the reasons cited were mental health and fiscal prudence. After all, solitary confinement drives prisoners insane, and bondage gear is much cheaper than solitary confinement cells.
But Total Restraint makes prisoners extremely vulnerable to the prisoners and guards around them, and many of them are Not Good People ... that's why they're in prison. Hooded, cuffed, shackled, gagged and deprived of all clothing, they are easy meat for the predators that surround them.
Here's a short story that that examines the pavement that is the road to hell for female prisoners in Total Restraint. It's basically a horror story, an erotic horror story, for it provides plenty of fuel for the darkest erotic fantasies.