I'm sorry but you are trying to take the conversation down an unacceptable and radical route. Wars are strange things, when we capture an enemy we keep them away from the battle until one side is defeated and then prisoners are released. We should just do the same. Until ISIS or whoever it is that is waging war upon our country is defeated we should arrest those who we believe are the enemy and keep them safe and away from the battle until ISIS or whoever have surrendered. They can be as radicalised as they like while they are locked up, because they can do no harm, and if ever released rearrested if they ever break the law........