Convicts are imprisoned as part of their sentence. That's the sentence... Removal from society and confinement. Dehumanizing them during incarceration is not the goal of the confinement, quite the opposite in fact. It is expected that one day the prisoner will re-enter society and the intent is that he will assimilate properly and conduct himself appropriately. While their stay in prison is not supposed to be preferable to freedom, there are certain luxuries that can help maintain their humanity while incarcerated.
You know how I know you have never been locked up?
While I totally respect your service in Afghanistan, if that is why you are there, I must chime in here. The only "right" I can recall having when I was in prison was food, and that doesn't mean good food, just a couple thousand calories of meh. Sure, "they say" you have a right to the law library, and some yard time, but it's not a "right" if they can take it away. Pretty much everything in prison is a privilege, not a right.
As far as porn goes, I can remember seeing some porn mags back in the 80's in Chino, but it wasn't widespread, and it sure wasn't something I was interested in at the time. It would be like looking at pictures of happy families, or anything that you might desire, I found it easier to cope by just being "here now". I actually saw a lot more "live porn" (men having sex) than I really wanted too, but even that was better than the "live rape porn".
It's not just a way to dominate another man, it's the ultimate humiliation in prison. Getting your ass kicked can earn you some respect, if you fight back, but getting punked can be the end of the road for a man. A lot of prison suicides are probably due to this, but they never get reported as what they are...always just another man that couldn't do his time.
I can't see why porn would be a bad thing if we're talking about some Playboy or Hustler mags for prisoners that have earned the privilege, but then where do you draw the line? Sure enough, some men will want gay porn, and that would be a tricky area, as gay sex is against all the rules.
Which brings up an interesting question; In the future, when the gays are no longer treated as second class citizens, will prisons be forced to allow gay sex?