I like the idea of Missionaries of Mercy sent as the Holy Father's specially envoys to release sinners from the direst of sins. It has a sense of 'no-one expects the Spanish Inquisition", gangs of clergy bursting into Mass and offering to reconcile even the foulest, most monstrous of sins.
It makes very good headlines but I am not sure what it really means.
In most diocese in the world the absolution of sins which at one time were reserved to the bishop, like procuring an abortion, are delegated to ordinary priests. I don't know if the South America experience is different but in an average parish there wouldn't be much for a Missionary of Mercy to do, except possibly amongst the clergy. Attempting assault on the person of the Sovereign Pontiff or interfering with a Papal Election, or revealing the secrets of the Conclave earn automatic excommunication, still but most sins that might need a Missionary of Mercy are very clerical in nature, for example:
Canon 1367 One who throws away the consecrated species or, for a sacrilegious purpose, takes them away or keeps them, incurs a latae sententiae excommunication reserved to the Apostolic See; a cleric, moreover, may be punished with some other penalty, not excluding dismissal from the clerical state.So unless these Missionaries are going to run in packs around the office of the Roman dicasteries I am left wondering is the Holy Father trying to advertise a gradation of sin? Does he want to bishops to take back and reserve to themselves abortion or child abuse or mismanagement of Church property and heresy or apostasy.
Canon 1370 §1 A person who uses physical force against the Roman Pontiff incurs a latae sententiae excommunication reserved to the Apostolic See; if the offender is a cleric, another penalty, not excluding dismissal from the clerical state, may be added according to the gravity of the crime.
Canon 1378 §1 A priest who acts against the prescription of Can. 977 incurs a latae sententiae excommunication reserved to the Apostolic See. [absolving an accomplice in a sin regarding the 6th Commandment]
Canon 1382 Both the Bishop who, without a pontifical mandate, consecrates a person a Bishop, and the one who receives the consecration from him, incur a latae sententiae excommunication reserved to the Apostolic See.
Canon 1388 §1 A confessor who directly violates the sacramental seal, incurs a latae sententiae excommunication reserved to the Apostolic See; he who does so only indirectly is to be punished according to the gravity of the offence.
Post Script: Yes, I hate that two headed man logo too