Sounds like a database maintenance problem, not an issue with the rationale for the publication of the database.
On the other hand, I’d be more comfortable if I thought that “sex crime” wasn’t such an amorphous category. Who knows what an offender actually DID? All we know is that it was sexual in nature. The offender might or might not be any kind of threat to me or mine.
In some jurisdictions being convicted of urinating in public gets you on the state’s list of convicted sex offenders.
Governments can do nothing well, and protect themselves by granting themselves unlimited power to take on projects and limitless protection for the mistakes they are bound to make.
It might seem like a good deal when government wants to take over something and assume the costs of it, but it never goes well. Period.