Catholic Priests can share in sin during Confession
“The priests of the Lord must therefore, so far as reason and prudence suggest, impose salutary and suitable satisfactions, in keeping with the nature of the crimes and the ability of the penitents; otherwise, if they should connive at sins and deal too leniently with penitents, imposing certain very light works for very grave offenses, they might become partakers in the sins of others.”Council of Trent, Session XIV, CHAPTER VIII