The problem with saying we don't want him in Britain is that he has to live somewhere. While I can't say I like the thought of a man like this being readmitted, it is preferable to trying to dump him on some other country - imagine the outcry if we let foreign convicted paedophiles into Britain! It works both ways.
I agree he doesn't deserve round the clock police protection. He should be monitored to ensure he is not allowed to move into a high risk area (e.g. near schools), but to be blunt if someone should find out where he is and attacks him for his behaviour, he has no one to blame but himself - he could have protected himself by not abusing innocent minors in the first place.
