Pray for our priests. They must each be sorely tempted (above that of a layman) by the world, the flesh, and especially the devil.
Even when a priest doesn't go full scandal mode (concubinage, sins against nature, etc.) there are a whole host of comforts that motivate a priest to perpetrate evils such as divisions within Tradition *cough* Fr. Cekada *cough*.
Wanting money, fame, power. Or small, normally licit earthly comforts like travel, art, music, books, eating out, wine, hobbies, etc. When the devil can't get a priest to fall into gross violations of the Sixth & Ninth, he gets him overly attached to one of these smaller "White Rabbits" (see: the Spiritual Exercises of St. Ignatius Loyola) that the priest just can't part himself with. His one achilles heel, as it were. Sometimes it's something like "his own will" and/or pride.
The devil uses this like a crowbar.