So they can try and live a reasonably normal life and have some protection and aren't getting abused by vigilanties.

Remember that there are more than just peadophiles on the sex offenders register.
Surely they should lose the right to protection when they have violated someone elses? Particularly if they are repeat offenders. I understand they need to be able to live their lives, but IMHO the right of the general public to be protected must come first.

I know this isn't a black and white issue but just wanted to throw my 2 cents in