That is right Fred, exactly right. The Baptismal exorcism is reserved only for priests and it is a simple exorcism. Priests used to say simple exorcisms during confession for people they were inspired by the Holy Spirit to do so. "Spirit of Lust depart from this person in the Name of Lord Jesus Christ", for example said silently. When a priest says such a prayer for a person it is powerful and much more effective than a lay person. And this one sentence prayer is an exorcism, a simple exorcism.
The devil knows that the clergy's prayers are powerful; so he has clouded the minds of many into thinking, in the extreme cases, angelic spirits don't exist. So praying against the devil as in a simple exorcism is deemed medieval. This type of thinking invaded seminaries and eventually exorcisms.
At this same time, a movement the Charismatic movement where Protestants, certain Evangelicals, and Catholics became popular. Since official exorcisms were not being performed or hard to obtain, possessed people sought help in these groups. It became popular to disregard the instructions that always accompanied the Leonine exorcism in regards to laity conducting exorcisms on possessed people. Even with priests present lay people began to mimic or act as if they were priests.
We as Baptized Christians are members of a royal priesthood. We can pray for those under our authority, our children, and members of our family living under our roof. Grandfathers and fathers used to make everyone go to Mass, say Grace before meals, etc.etc. or move out. Families would gather together in the evening for daily prayer and say the Rosary and some would say the Leonine Prayer as a simple exorcism per instruction of the Holy Father, Pope Leo XIII. This is a private prayer and devotion said under the authority of one's Baptism, personal faith & holiness.
When lay people and even priests pray the Leonine prayer they don't say "by my priestly ministry." A priest has to have permission from his Bishop to say this. These words then change the entire character of the prayer because then it becomes a public rite. It then carries the full Weight and Power of the Church and can only be said in this manner for possessed people or some instances for infestations.
As a matter of convention today exorcism means the "official exorcism", an official public rite. This can lead to confusion and has. The exorcism prayers in the Roman Missal are not spells or incantations. They are prayers. The trouble begins if they are abused by saying them as if one is a priest, an ordained priest.
Cardinal Ratzinger's letter was in response to people using the Leonine exorcism prayer for people that are possessed. I remember when Charismatic groups led by lay people were attempting exorcisms on people suspected of being possessed. Full demonic possession we all agree is uncommon. It is possible for someone to do what they were doing for a life time and not see fully possessed person. Unfortunately back then some did and it was a disaster. Even the devil obeys Canon Law. He is a liar and the author of confusion. So these people thought the power is in the exorcism prayer; but the real Power is in the Church, the Mystical Body of Christ.
Padre Pio didn't break any Canon Law but he was truly united to Jesus Christ. He performed Signs & Wonders not just to alleviate people of their ills but to reveal that Christ was the Messiah. He was also a very humble man who obeyed and followed Christ who loved people so much that he healed and delivered people that he was beaten & tortured by the Devil.
Now Satanism is an official recognized religion in the USA & in Great Britain. Many have lost their faith and have been filled with evil and do evil things. Some asked in this forum if I thought the world was more evil now than when Christ was crucified. Christ came to be crucified and told St. Peter "Satan get thee behind me." God loved the world so much that He sent His only Son into the world to be Sacrificed and Atone for all the sins of Man, past, present, & future. Yet the world has turned away from Christ. The Bible tells of a time when men will turn away from Christ and in this vacuum Satan will prevail. One is either in the Camp of the Lord or in Satan's grip. There is no middle ground.
How can one not see that not just this country but the world has fallen. Church leaders account for the increased number of possessions to Satanism, in it's many forms both organized and unorganized.