Yes, of course. We have the sacrament of confession where repentence meets the absolution of sins. A man struggling with sin can find solace there. I know this is hard for you to accept.
You would rather damn the sinner. I don't get where you assume that the sin is "willful." Like I said, perhaps you have no experience with struggle with sin.
Anyway, regardless, the state of the priest has nothing to do with Christ's ability to work through the man.
This too, you dont' seem to want to understand. If God can work through a man with a little sin, He can work through one with a lot.
SD