Malpractice of clergy
Fraudulent religious leaders
Abuse of religious office
Illegal activities of church officials
Intimidation by priests
Misappropriation of church funds
Sexual abuse by priests
Church collaboration with enemy forces
Whilst the Catholic bishop who broke his vow of celibacy is able to confess his "sins", truly repent, be granted absolution, and receive the sacraments, Catholic divorcees are excluded from communion and are considered adulterous if they remarry or have a loving physical relationship with another partner.
The Authority of the Church's teaching has never depended on the faith or moral perfection of her ministers. Imperfect instrument (vessels of clay ?) do not invalidate the treasure they hold.