Can you be sure you are infallible in understanding these decrees? It is a serious question too...could you be mistaken?
Sure. From a
historical point of view, absolutely not. Secular historians, even atheistic ones, virtually all acknowledge the fact that Catholics, from before the time of Saint Augustine, until well after the Reformation, believed that
all non-Catholics perished in the "eternal fire." Catholic liberalism, which began in the 18th-century, introduced the theological novelty of "invincible ignorance," which is now applied to virtually all non-Catholics, by traditionalists and modernist Catholics alike. Here is but one historical example out of many:
http://smu.edu/ijas/1431trial.html"When it was explained to her what the Church Militant meant, and [she was] admonished to believe and hold the article
Unam Sanctam Ecclesiam, etc., and to submit to the Church Militant,
She answered: I believe in the Church on earth; but for my deeds and words, as I have previously said, I refer the whole matter to God, Who caused me to do what I have done.
She said also that she submits to God her Creator, Who caused her to do what she did; and refers it to Him in His own Person.
Asked if she means that she has no judge on earth, and our Holy Father the Pope is not her judge,
She replied: I will tell you nothing else. I have a good Master, Our Lord, in Whom I trust for everything, and not in any other.
She was told that if she did not wish to believe in the Church and in the article Ecclesiam Sanctam Catholicam,
she would be a heretic to uphold [her views],
and that she would be punished by other judges who would sentence her to be burned.
She answered: I will tell you nothing else. And [even] if I saw the fire, I should tell you what I have told you, and nothing else.
Questioned as to whether, if the General Council, that is to say our Holy Father, the Cardinals [and the rest] were here, she would be willing to submit..."
Many other historical examples exist.