Well, prisoners do get to buy regular (not cable) televisions, walkmans, and do exercise in a yard that has a basketball hoop.<quoted text>
You list of "Facts" are anything but. Correction officers will tell you that weight rooms, basketball hoops, televisions, radios...
You are right in that C.O.'s use these as management tools.
But you are far from correct in that these facilities are still spartan at best. Often toilet paper and fresh vegetables aren't even available.