It's said that the full deposit of the faith was revealed by Jesus. For example, before Vatican II the Church was overtly anti-Jewish. St. Thomas Aquinas writes in the Summa Theologica that "it would be licit, according to Tradition, to hold the Jews in perpetual servitude for their crime against Our Lord." The Church had the Good Friday prayer that addressed "the perfidious Jews." That prayer is no longer said. The Church sanctioned the expelling of Jews from many nations. The Church in some places made the Jews wear special symbols so that they could be distinguished from gentiles. In the 17-19th centuries you had a series of popes condemning the rising influence of "Judeo-Masonry." St. Pius X had a conversation with Theodore Herzl and told him that he can't recognize the proposed state of Israel until the Jews recognize the Church and convert. This overtly anti-Jewish attitude of the Church that existed for 1960-odd years just seemed to vanish after Vatican II, and was replaced with a positive view of the Jews. I've even heard senior Churchman refer to Talmudic Jews as elder brothers of Catholics. This 360-degree about face on the subject of Jews is just one of many radical changes that occurred to the Church in the wake of Vatican II. If the full deposit of the faith was revealed by Jesus, then how can the Church teach contradiction? How can the Church teach one thing about the Jews for nearly two millenia, and now practically fawn over them?
I disagree with the OP about his thesis that the Church has always been overtly anti-Semitic/Jewish. The examples are not compared to the time period in which they were expressed to see what the rest of the world said and how they said what they said. As a matter of fact, the Church has not been anti-Jewish in any official capacity.
St. Augustine has been infamously accused of many things including being anti-Jewish, yet his ruling in favor of a Jewish man in a case brought before him by the Jewish man in which the man's mother sold property that belonged to him to a bishop. The bishop in question refused the man's request to return his land in which he offered to pay the bishop. This is why the man brought his case before St. Augustine. After reviewing the case, Augustine wrote to the bishop in question and told him he was sure he wished to do the right thing and told him he had to return the Jewish man's land to him. Sounds anti-Jewish? Didn't think so, because Augustine was not an anti-Semite. Nor was Aquinas.
Gregory the Great "emptied the papal treasury to ransom prisoners of the Lombards and to care for persecuted Jews and victims of plague and famine" (http://www.catholicculture.org/culture/library/fathers/view.cfm?recnum=3466).
What Vatican II did was to open new frontiers by referring to the Jews as our elder brothers in the faith from which all Catholics come. Much good fruit has been borne with the improved relations between Catholics and Jews (amongst all religious traditions and non-Christian religions).
A classic example would be the Jesuit's Civiltà Cattolica articles:
The Church has always been against Judaism, but never against Jews as a race. She has allowed the Jews, even in the times when Church and State were closer, to raise their children in Judaism.
See also the article "Maximilian Kolbe to the Masons: You Are Controlled by the Jews," which also discusses the Church's condemnation of the anti-Christian Talmud, which, along with the Torah, are the Jews' two sacred texts.
Where exactly are you taking this quotation from? Also, St. Thomas doesn't advocate enslaving Jews; he'd rather they convert. For a good opusculum on St. Thomas's views of the Jews, see: Epistola ad ducissam Brabantiae.
The Jews' own laws proscribed this (cf. St. Thomas's Epistola ad ducissam Brabantiae q. 8).
Yes, like Pope Leo XIII's encyclical against Freemasonry and naturalism, Humanum Genus, or Msgr. Dillon's Grand Orient Freemasonry Unmasked, which Pope Leo XIII highly recommended every Catholic read.
The Church doesn't teach contradictions; the Vatican II Conciliar Church (which is not the Catholic Church, but really a puppet of the Jews) teaches these things.
Read Maurice Pinay's Plot Against the Church, which was sent out to all participants of Vatican II as a warning of Judeo-Masonic/Communist hijacking of the council.
Drawing from: Judaism | Crossing the Threshold of Hope | Pope St. John Paul II [the Great]
Why did the Catholic Church change so radically after Vatican II in regards to the status of Jews?
It is not so much a radical change, than recognition that while there have been setbacks and obstacles in the past, the insights which inspired the Declaration Nostra Aetate are finding concrete expression in various ways, all being under the mysterious workings of God and his plan of Salvation for all peoples.
The insight of this saintly Pope, shaped by personal experience, has also helped mold the post Vatican II relationship between the Church and the the people of God of the Old Testament:
For the true children of God in the Old and in the New, there is always this understanding:
Vatican II was implemented by the Roman Catholic Church basically to ecumenise with other Christian Denominations. And the ultimate goal in doing this is to finally end up causing the Protestant Churches who are supposed to be protesting against the unbiblical doctrines and practices of Rome to stop protesting and to unite with the Catholic Church on common points of doctrine, or else to finally become Catholic themselves.
And so that is why they changed their stance in regards to the Jews as well as the Christian Protestant Churches. Now we see things like Tony Palmer and how when he was alive he, the Jesuit Pope Francis and Protestant Preacher Kenneth Copeland all united and claimed that there was not any more protest from the Protestants. That was the Roman Catholic Church's goal from the start. They desire to squelch the protest of the Protestants and of other Religious groups.
One of the tricks the Catholic Church used to bring about this ecumenical movement was to change their music. They would have a more laid back style of music and become more 'Protestant-like' in their worship services. And at the same time they infiltrate Protestant Churches and seek to make them a little more 'Catholic. So then, with the Catholic Church becoming more Protestant, at least outwardly, and the Protestant Church becoming more Catholic in reality... soon you will not be able to tell the difference between the two.
The Order of the Jesuits was created to counteract the Protestant Reformation and to undo any of the progress the Reformers had made. The Catholic Church said that Jesuit Teilhard de Chardin was the 'guiding star' behind the Vatican II. The Jesuits are known for not sparing any disguise to achieve their goals. They have what's called Inculturation and Acculturation. One is to infiltrate other Churches to make them more Catholic and the other is to make their own Church more Protestant to disguise the differences between the two so that finally you won't be able to tell the difference. The goal is to make the entire World Catholic and to wipe out Protestantism. That was what the Jesuit Order was formed for, and that is what the current Pope Francis is, a Jesuit.This tells us that their goal has nearly been achieved. Do they have to pretend to like the Jews? No problem, they will do that if that's what it takes to convince people that they are not going to do like during the Dark Ages when millions of protesters were tortured and killed because supposedly they were 'heretics' for simply disagreeing with Rome's doctrines. Have the Pope kiss the Koran in public? No problem, they will do that too, if that's what it takes to make people view them as being no threat to other Religions.
ADDITIONAL STUDY INFORMATION
One of the major activities of the Jesuits involved something called "Inculturation".
Malachi Martin explains it like this:
"The idea was to adapt so severely to the culture of the alien (one who was not a Catholic) that the missionary would acquire the mind of that culture, and would revamp both doctrine and moral practice to fit that alien culture." - The Jesuits, Malachi Martin.
And then there is another tactic that the Roman Catholic Church is using called "Acculturation". This is something that means to adapt the practices of your own church-such as your worship format-to the practices of the different cultures or denominations that you are seeking to win over to Catholicism.
In this way, they believe, people will feel "comfortable" in the Catholic church and perhaps eventually join the catholic faith. For instance, Malachi Martin, former Jesuit, tells of how in some Catholic churches now they have coffee afterwards for "socialization time". Their bands play "Blues music-using trombones, kazoos, saxophones and top it off with drums to add a rhythmic foundation." - The Encounter, Malachi Martin.
And a Catholic priest, Andrew Greeley, tells a story of how things have changed in the Catholic church, for the purpose of enlarging their congregations:
"In many new Catholic churches, statutes, the stations (of the cross), and the stained glass windows have either been swept away or reduced to the diagrams or abstractions that would not offend the most fundamental protestant. Reverence and awe have been replaced by often cloying informality; solemnity by 'letting it all hang out' manners. Great music has been replaced by bad pseudo-folk music... As part of the final phase of our acculturation into American life, it became appropriate to abandon the whole mess, to... eliminate the mysteries and the medals, the invocations and the pieties, the blessings and the rosaries, the May crownings and the mumbo jumbo." - How to Save the Catholic Church, Andrew Greeley.
This is similar to Nero-linguistic Programming which is a form of hypnotism. There is a method used called 'Reframing'. They pretend to find common ground in which they agree with their opponent. This causes the opponent to relax and feel more at ease. But then they are lured a little at a time over to their own view until the opponent doesn't even realize that they have completely changed their view.
Celebration and Vatican II
The Vatican II Council issued recommendations on liturgy—the singing, prayers, congregational responses, and Scripture readings that make up a church service. These directives discussed ways to incorporate the whole church community in the service, making them more involved in worship procedures.
Churches were encouraged to shift away from traditional sermons that exhort and equip and instead concentrate on the cursory reading of extracts from the Psalms and Gospels. They were instructed to replace traditional hymns with popular music, modern musical instruments, and physical movement of the congregation. Churches were also encouraged to adapt their styles of worship to suit their cultures. The liturgical section of the Vatican II document, Volume 1, can be summarized as follows:
The "Instructions on Music in the Liturgy" section of the Vatican II document says this:
"...the unity of hearts is more profoundly achieved by the union of voices, minds are more easily raised to heavenly things by the beauty of sacred rites...In order that the faithful may actively participate more willingly and with greater benefit, it is fitting that the format of the celebration and the degree of participation in it should be varied as much as possible, according to the solemnity of the day and the nature of the congregation present...The participation (a) Should be above all internal (b) Must be, on the other hand, external also, that is, such as to show the internal participation by gestures and bodily attitudes, by acclamations, responses and singing."
--Austin Flannery (ed.), "Instructions on Music in the Liturgy," Vatican II Council: The Conciliar and Post-Conciliar Documents (New York: Costello Publishing, 1979): 81, 83-84.