Q. You have put forth a single case of the Church actually asserting such occurrence [of mortal sin] for a non-normal human. However, the assertion is not supported in the CCC,
which is the reference for all modern teachings.
A. I do not use the term non-normal so that is understandable. The Church has the sacrament of penance for mortal sins, and canon law on its useage, etc. today. It is the remedy for mortal sins committed after baptism. The Church would not have it if it was not necessary, and that is modern and in the CCC. The First Constitution of the Fourth Lateran Council in 1215 taught that souls are in hell now.
Q. The “binding and loosing” is a very controversial concept.
A. Not for the Catholic Church.
All actions chosen by people are voluntary, regardless of their mindset. You have not denied this.
Q. “Use of reason” is not an on/off button. Reason is attained not through simply hearing and incorporating, but integrating what the heart knows about value, the infinite value of people. You have not contested this.
A. Attained the use of reason refers to mental capacity, per the Church. See Canon Law
CIC
Can 97 §2. A minor before the completion of the seventh year is called an infant and is considered not responsible for oneself (non sui compos). With the completion of the seventh year, however, a minor is presumed to have the use of reason.
Can. 99 Whoever habitually lacks the use of reason is considered not responsible for oneself (non sui compos) and is equated with infants.
Q. If a person has sufficient knowledge, in an all-encompassing sense, knowing and having in mind in real priority everything that is relevant, they choose not to sin. … People desire what is good.
A. There is a comparison of goods presented by the intellect and the will makes the final decision. Mortal sin is a result of the willful choice of a good chosen that is not the highest good. Much Catholic teaching on that exists, which I posted some of, from St. Thomas Aquinas.
Q: What is the reasoning in the mind of someone who chooses ignorance? When a person is willfully ignorant, they do not know what they are doing. They are not attentive to what is true. You have not contested this.
A. The Catehism should suffice, since I do not use your phrase “know what they are doing”, nor does it:
1791 This ignorance can often be imputed to personal responsibility. This is the case when a man "takes little trouble to find out what is true and good, or when conscience is by degrees almost blinded through the habit of committing sin."59 In such cases, the person is culpable for the evil he commits.