>>573110
Read the documents where dogmas were proclaimed, popes explain why it was proclaimed pretty extensively, for example the immaculate conception:
http://www.papalencyclicals.net/pius09/p9ineff.htm
As for V2, religious freedom is not part of the teaching on faith and morals so it can be changed. Read any pre V2 encyclicals for great arguments against it, especially Leo XIII.
This is a good overview from pre V2 popes:
http://biblelight.net/freedom.htm
For example, Pius IX wrote
>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,"* [2] 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.
V2 theologians actually said they knew they were going directly against the Church has taught on religious freedom for its entire existence.