Henry VIII wasn't the only royal/nobleman who sought to terminate his marriage.  His approach wasn't what was accepted. 

Joseph Ratzinger's teachings ARE NOT the Church's official teachings.  Ratzinger was  a representative of the Augustinian theological 'camp' at Vatican II.  The narrow Augustinian theology blamed the primacy of conscience for everything from the impudence of freedom of the press to the skepticism of historicist thought.

During the pontificate of JP II to his own pontificate, Ratzinger's teachings represented the most narrow interpretation that polluted the hierarchical teaching office's position on conscience until
March, 2013.  

References:
Brian Lewis, "The Primacy of Conscience," Australian eJournal of Theology 6 [February 2006]:1

John W. O'Malley, 'What Happened at Vatican II' [Cambridge, MA:
Harvard University press, 2010], 48-52.

Linda Hogan, "Confronting the Truth: Conscience in the Catholic Tradition' [Mahwah, NJ: Paulist Press, 2000], 98.