> if it’s handled only within the Church then the only penalty are things like defrocking or banning from the church
To be clear, things said under the "seal of the confessional" cannot be shared by the priest with anyone else _even within the Catholic Church._ This particular situation is not a matter of the church trying to handle matters internally, but more of a recognition that the penitent is confessing their sins to God and the priest is only acting "in persona Cristi" (and thereby is prevented from pursuing other personal or societal objectives based on information revealed).
To be clear, things said under the "seal of the confessional" cannot be shared by the priest with anyone else _even within the Catholic Church._ This particular situation is not a matter of the church trying to handle matters internally, but more of a recognition that the penitent is confessing their sins to God and the priest is only acting "in persona Cristi" (and thereby is prevented from pursuing other personal or societal objectives based on information revealed).