The church can say anything it wants. The church spent decades covering up extensive pedophlia. The church is worthless when it comes to “facts”.
The question is: Do YOU believe what “the church” says?
The Church's dogma is that all are "fallen" and subject to "original sin," and so none is sinless and none is worthy of salvation - because all are wretched sinners.
When one accepts oneself, essentially, as born with a sinful nature, then clearly the priests and bishops cannot be expected to have sin-free lives. That's why they will have various defalcations, even criminal issues. They are that way by nature.
That doesn't mean they can't also recognize what their dogma suggests is "sin."
EDIT to add - if we proceed on that premise, then one can accept oneself as sinful by nature, do one's best to avoid it, and engage in self-reflection to improve one's behavior. If one examines the Catholic processes, it often seems like that is what the dogma and rituals are designed to do. They want you to go to church weekly, then they want you to go to confessional. Church causes you to regularly reflect on moral issues. Confessional causes you to regularly self-examine and address one's defalcations and penance/atonement pushes one to try to be better.
Naturally, people will have different views on what behaviors constitute good and bad, or reprehensible, etc., and what is minor or major, etc. But, if we go through the biggies, like, Pride, Envy, Anger, Sloth, Avarice, Gluttony, and Lechery, we wind up with a fairly good guide -- those are the innate feelings that lead us to do bad things - pride, anger, sloth, avarice, gluttony, lechery, they lead us to do things like brag, hit/kill, lay around idly, unfairly take advantage or exploit, overstuff ourselves, and be sexually excessive, etc. So, being self reflective about those things can really help some folks be better.
