Well IF it's true, I don't condone that sort of thing, despite my low opinion of, and lack of sympathy for, OJ.
I don't think prisoners should have to fear violence from other prisoners; if the department of corrections has custody of you, they have as much of a duty to protect you as they have to punish you. I don't buy the excuse that the guards can't control it; they have the keys and the guns.
Not that I think prison should be a resort. Put prisoners on a chain gang, make them work 18 hours per day, deprive them of recreational activities and mental stimuli-- that's all fine with me. But all punishments should be administered by the DOC.