If official teaching on the Church was a bit more clear that the issue is exactly that. then I think there’d be less debate on the issue.
THIS IS THE POST DELAYED BY THE MODERATOR - I have no idea why.
Well that is just my personal translation into post enlightenment English of what the Magisterium is saying in its arcane Aristotelian use of English - after six years Thomistic theological training under Dominican professors, two engineering degrees and a further 30 years reflection trying to make sense of both schizophrenic vocabs. Maybe I ma mistaken but it seems to respect both worlds and still makes sense to me

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… you can’t take a pill to help keep you from having kids, but you can take one to assist in the opposite aim.
Yes its an interesting contradiction but I think only apparent. In a non fallen world abstention would be the correct answer, just as there would be no private property.
But I think its fairly objectively clear in a virtue based ethics system why a pill can be taken to assist with sex but not the reverse. Sex has a normative biological trajectory and when we freely choose to frustrate it a line is crossed re the sort of people we are making ourselves into and intent (which consciously or unconsciously, shapes who we become).
That is not to damn BCers of course. But its now walking a moral tightrope without a safety net.
Nor is it to grace all NFPers - one can still have a malicious anti-life intent while doing what the Church says.
I suppose the true test is what a couple decides when their chosen method fails. I accept many BCers would not think of aborting. Grace is mysterious and personal and concrete and particular and cannot be presumed simply on the basis of engaging in (allegedly) always and everywhere gravely disordered acts. We all operate from chasms of both unfreedom and freedom where God’s wind whistles.
Of course, the means the sacrifice of the implicit appeals to nature that makes the doctrine more intellectually digestible to many in favor of bald and seemingly capricious appeals to authority “in the name of God” by those who claim to wield that authority. But if the shoe fits…
The Church has many tools for assisting the faithful at different levels of moral maturity. I personally tend to think HV was more disciplinary than it was doctrinal - though it was doctrinal.
I don’t believe the issue is as doctrinally “always and everywhere” as JPII’s VS makes out. Like Communion practise much of it I suspect is disciplinary. The Church was ripping itself apart on the question and the Pope basically said, “this is how it is for the moment, no more theological debate, just do what you are told and this is how high I want you to jump going forward.”
In fact the Church has been very lenient in the confessional, with even the Magisterial Vademecum advising priests to “turn a blind eye” to some extent for the faithful who were judged “invincibly ignorant” and allow them Communion even if they kept on using BC.
In fact many priests had reached that conclusion independently even without the Vademecum I suggest.