Any registry of any type should concern you.
It sets a dangerous precedent for one.
They don’t work for two.
Gun registries are one thing. Predator registries are not even comparable.
Predators have already proven to be unsafe to society, that they are still breathing free air should concern everybody - especially parents.
I don’t see a difference between a 30 year old sex addict seducing 16 or 17 year olds for “consensual sex” and a child rapist. Society is better off without them both.
Amazing how your worldview changes when you become a parent.