Yes.
You cannot punish someone for what they may do in the future, based on what they have done in the past.
Whereas I would argue that any sex offender who is changing their identity should be legally compelled to furnish that information to the police, the right of privacy and protection applies to all citizens, even those who have been convicted of crimes and punished.
It may appear wrong that perverts and child molesters are afforded the protection of the law, but to apply law fairly is the only way law can work effectively.
If you start condemning people over and over again when they have been convicted and punished, the you erode the concept of law and justice which can only operate if all applied without prejudice.
So although I entirely agree with the emotional anger behind your question, I have to argue against the notion that it is woolly-headed left-wing nonsense.