The issue seems to me threefold this way:
1. Punishing the guilty (only Hashem can truly do this).
2. Keeping the guilty from repeating the offense. Unfortunately, there is no known cure for this and while
“the Torah does afford *anyone* the opportunity to *fully* repent”, do we truly have an obligation to believe naively that someone has repented from this??? A tzadik who is seen violating the Torah must be judged favorably, but a rasha?
3. Keeping the laws of the Torah and l’havdil our host country. It would be very interesting for me to know what the halachos and secular laws are about conspicuously posting the photo and details of a known juvenile offender.
Peronally, I’d rather have safe, worried kids than unsafe, clueless kids. Please talk to the kids in your life and keep them aware of the potential dangers and how to stay safe.