This I want to hear. Explain.
Consider this conflict between the infallible Quanta Cura and Vatican II: Pope Pius IX, Quanta Cura 1864:
And, against the doctrine of Scripture, of the Church, and of the Holy Fathers, they do not hesitate to assert that "that is the best condition of civil society, in which no duty is recognized, as attached to the civil power, of restraining by enacted penalties, offenders against the Catholic religion, except so far as public peace may require." From which totally false idea of social government they do not fear to foster that erroneous opinion, most fatal in its effects on the Catholic Church and the salvation of souls, called by Our Predecessor, Gregory XVI, an "insanity," viz., that "liberty of conscience and worship is each man's personal right, which ought to be legally proclaimed and asserted in every rightly constituted society; and that a right resides in the citizens to an absolute liberty, which should be restrained by no authority whether ecclesiastical or civil, whereby they may be able openly and publicly to manifest and declare any of their ideas whatever, either by word of mouth, by the press, or in any other way."[...]conflicts withTherefore, by our Apostolic authority, we reprobate, proscribe, and condemn all the singular and evil opinions and doctrines severally mentioned in this letter.
Vatican II, Dignitas Humanae 1965:
The council further declares that the right to religious freedom has its foundation in the very dignity of the human person as this dignity is known through the revealed word of God and by reason itself.(2) This right of the human person to religious freedom is to be recognized in the constitutional law whereby society is governed and thus it is to become a civil right.It is in accordance with their dignity as persons-that is, beings endowed with reason and free will and therefore privileged to bear personal responsibility-that all men should be at once impelled by nature and also bound by a moral obligation to seek the truth, especially religious truth. They are also bound to adhere to the truth, once it is known, and to order their whole lives in accord with the demands of truth However, men cannot discharge these obligations in a manner in keeping with their own nature unless they enjoy immunity from external coercion as well as psychological freedom. Therefore the right to religious freedom has its foundation not in the subjective disposition of the person, but in his very nature. In consequence, the right to this immunity continues to exist even in those who do not live up to their obligation of seeking the truth and adhering to it and the exercise of this right is not to be impeded, provided that just public order be observed.
Nobody can be converted to Catholicism at the point of the sword, period.
When Vatican II opened, World War II was fresh in the minds of the council fathers. In Croatia, the Ustasha used the sword to forcibly convert Serbian Orthodox Christians to Catholicism with the participation of the Franciscans.
Dignitatis Humanae was a direct result of this sort of experience.
There’s no conflict there. Religious freedom is a right like the rest of the others under natural law.