Additionally you would have to wonder why he would risk continuing to live there. 
I think you have hit the nail right on the head with that question. WHY?
I am beginning to believe that the compulsion to do things overwhelm some people to the extent where not only does the safely of others not bother them, but their own safety seems not to matter either.
Why would a person seek a job when they know their sordid past will catch up with them and they will again become a target for hatred and constant threat of physical harm by people that also cannot control themselves?
To a person of this kind, I think that control of the kind a civilised nation can exert, is completely futile, they will offend again and again, whenever an opportunity is available, regardless of the consequences!
This level of compulsion is base, and nothing will halt it. It is akin to asking a person to stop breathing.
I am not singling out paedophiles for these observations as it manifests itself in many different ways according to the person. Other equal morbid obsessions are less evident as the compulsive acts are often legal. Take eating as an example, or adulterous behaviour as another.
I believe that paedophiles should be reclassified from criminals to Compulsive Obsessive Disorder sufferers and treated accordingly for an assumed lifelong condition, where there is no hope of improvement without active intervention with drugs or surgery or whatever means can be shown to work. If nothing can be shown to work then the only answer is segregation or isolation.
In any event, we need to recognise that the current legal application is achieving absolutely nothing in the way of punishment or prevention. There is little point in punishing a person who apparently can not help but do what his instincts tell him to, the only answer is to remove him from the temptation to err.
