Bishop Tissier de Mallerais gives an excellent exposition of how the Second Vatican Council, propped up by earlier modernists, falsely promotes the separation of Church and State. Bp. de Mallerais highlights in particular, Pope Benedict XVI's later confirmations of these same errors which reject the Social Kingship of Christ.
Here is an excerpt from Bp. de Mallerais' Faith Imperiled by Reason: Benedict XVI's Hermeneutics, from a chapter entitled, "Christ the King Re-envisioned by Personalism":thecatacombs.org/post/7174
"So let us be confident, let us not be unprepared, let us not be outflanked, let us be wise, vigilant, fighting against those who are trying to tear the faith out of our souls and morality out of our hearts, so that we may remain Catholics, remain united to the Blessed Virgin Mary, remain united to the Roman Catholic Church, remain faithful children of the Church."- Archbp. Lefebvre 1980