In this case, "Roma locuta, causa confusa."  If the "reasons" given by St JP2 are good enough for you, not so for me.  It is simply a repetition of CCC 1577, which is a fundamentalist interpretation of a decision made by Jesus during his mission to the people of Israel UNDER THE OLD LAW.  It also violates a basic principle of biblical exegesis, which is that no text can be fully understood in isolation from the entire deposit of faith.  That CCC 1577 is not persuasive for many people may or may not have been the reason for issuing the edict to stop discussion.  There may have been other reasons but, having studied the Catechism of the Catholic Church, and the Theology of the Body, it is hard to imagine that a man with the holiness and awesome erudition of JP2 really intended to define a dogma in such a defective manner  Be assured that I am by no means trying to convince you.  This is a com-box dialogue, an exercise in listening to each other, not a zero sum debate.  Domimus vobiscum!