Chances are pretty good that it’s the priest doing the abusing.
Priests confess, too, to superiors.
But in the Catholic system this is considered to be a religious act — the confessor wants to quit sinning, and ideally it will be caught at the point of lustful thoughts before any molestation.
A priest can't confess to himself, and a penitent is free to select any priest they wish to confess to, so I'm not sure what your point is.