Aquarius:
Had there not been a loss of a moral base of sexuality, would that have an effect on the infallibility of the teaching? I would think an infallible teaching would be known to be infallible at the time it is issued.
No, not an effect on the infallibility of the teaching, but it would have had an effect on the acceptance of the teaching.
It is well accepted that the teaching of the Church has been for 20 centuries that it is morally wrong to take an innocent life. It is not that the teaching has to be marked infallible; it is the fact of acceptance or rejection of the specific issue (e.g. assissted suicide) which is expanded upon as a part of that infallible teaching.
The issue of the immorality of assisted suicide is not a “new” moral teaching, it is a seamless part of the same theological position held for 20 centuries - killing innocents is wrong.
Some will accept that issue and violate it; that is, they will have a correctly formed conscience and not follow their conscience. That is sin.
Others will not have a correctly formed conscience; they see a family member in pain, believe that suffering is to be avoided at all costs, know the family member is terminal, and in an emotionally driven act will assist in the suicide, believing they have done good for the family member. if they are following their conscience, it is at the minimum questionable if they have committed a sin; particularly if they were not properly catechized, and did not understand the moral wrongness of the act.
In either case, the issue is still infallible; it is morally wrong to kill an innocent person.
They may not have understood the teaching; they may not have accepted the teaching; they may not have heard the teaching. None of that goes to the issue of infallibility. The reasons that people may not know a teaching is infallible or may hold that it is not can be numerous. Having a correctly formed conscience requires more than just assuming that all bets are off if the issue is not defiened by either a council or a clear ex cathedra statement. It takes time, study, and prayer helps.
Bottom line - I really wonder how many people using ABC, who have heard the Church’s position, take it up in prayer and meditation, and how many simply take the postion of “Don’t confuse me with the facts; I already have my mind made up”.