Jail is fertile ground for rebellion in all cultures. All inmates claim to be innocent. The people inside have a built in incentive to be hostile to the system that put them in there. Throughout history, leaders of rebellions did time in jail. In other words, jail is a ripe place for violent, rebellious, ideology. The idea of placing Islamic terrorists into U.S. jails is only asking for violent trouble.
Placing Islamic terrorists into the U.S. prison system will be about the best move in the world for our enemies. The Islamic ideology is a very comfortable system for those who need strict controls. Islam has one of the most strict legal systems (If not THE most strict) in the world. Islam is also very clear when force and violence is allowed, which is surprisingly often. The balance of strict controls of behavior combined with lax restrictions upon violence and warfare would appeal to those who are subjected to a restricted life and constant physical threats.
I am not a psychologist. Experts in this field would be probably being far better at explaining the influencing factors at work. However, I do know that extreme situations call for extreme measures. This is why warfare and combat tend to bring out the best and worst in people. Islam is an extreme ideology and as such is ideally suited for extreme situations. The strict measures to be implemented, the 1400 years of legal jurisprudence that is available and the ready supply of ‘legal’ experts are good reasons as to why Islam is so easily implemented in areas where the state (Or ‘nation’) has failed. This is just what the inmates of jails would find appealing. Just what we have avoided by our placing these individuals in Gitmo. And what we would do well to avoid in the future.