Motive?
Is this really about actually finding child abusers and preventing child abuse, or politicians trying to show that they are actually doing something about child abuse?
I would look at how much effort the proposers of this are actually putting into social services and child protection agencies to protect children (tragically far too many references to put here, but look up "Baby Peter", "Victoria Climbie", "Rotherham child sex scandal" and lots of others).
Biting the hand that feeds IT
