Ladislaus, sorry for taking so long to get back to you about this discussion.
It seems that the main point of contention is that Saint Augustine held that an unbaptized infant, who died, would suffer some degree of pain (almost nonexistent) whereas, Saint Thomas along with other Scholastics held that those infants would enjoy a natural happiness with no sense of pain. Saint Thomas’s opinion seems to be held almost universally now, however it must be noted that Saint Augustine’s opinion has not been condemned.
You stated that the Church allowed an “erroneous view” concerning the state of unbaptised infants formulated by St. Augustine and supported by “every theologian for over 700 years”.
I say that you must first must prove that this “erroneous” opinion was in fact condemned by the Church. I’m not sure if there is any theological centure attached to it. If you know of one please enlighten me. Actually, I see that his opinion has been abandoned, but not actually condemned. Secondly, you must prove that his opinion was universally held by all theologians. The article says that the opinion had “undisputed supremacy”, but not that it was held unanimously.