Ths sins of a priest

 Why does the world hold priests to a higher standard than, say, a teacher or even a scout master? Is it unjust for them to do so?

Here is a quote from this article in the National Catholic Register citing St. Alphonnsus Liguori and St. John Chrysostom:

St. Alphonsus explains how the virtues of a priest should surpass those of the laity. “Priests should be holy, because God has placed them in the world as models of virtue,” he says. With this in mind, he warns how grievous it is for a priest to sin, “because he sins in view of the light.” How much better would it be a for a priest who falls into sin “to have been a poor uninstructed peasant, who had never known the law!” 

Quoting St. John Chrysostom, he continues: “The sin to which the priest consents may be committed by many seculars, but his chastisement shall be far more severe because his blindness shall be far greater than theirs.”