There is nothing whatever in Canon law or Church teaching that prohibits a discussion of … Church teaching.
Since I have an obligation to the truth I must point out that is not what I said. I stated, truthfully, that I could not debate the meaning of Apostolic Authority, one particular subject, in this way (a public, anonymous, forum), at this time. And I noted that the limit was not a broad one, but an individual one, based on my own particular circumstances.
Now, I realize, you were simply trying to collapse something I had stated into an absurdum, ridiculous on it’s face, hence easily dismissed. But although it is not even remotely close to my statements, your statement above is, in of itself, quite incorrect. And, fortunately, this is an area I am quite free discuss.
There are actually many circumstances that could arise in Canon law where discussing Church teaching could be prohibited for an individual or group of Catholics. Like a Catholic asking his bishop for permission to join the seminary and become a priest and permission being granted with the condition that the applicant cease expressing public opinions on Canon Law during the formative period of his training. These sorts of conditions are generally licit and recognized in various forms of the Ecclesiastical court.
But we don’t have to go off topic. Anyone who follows the Associated Press knows that the Holy See has a position on gun control. As the recent Vatican editorial praising the Obama administration’s “first step” noted, the Church’s position is already in pastoral documents.
Now look at the document you provided:
vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_19900524_theologian-vocation_en.html
If you don’t have the patience to read the whole thing, just read Section IV, it covers how theologists and the Magisterium are supposed to interact and “The Problem of Dissent”.
Now, imagine you are a Catholic theologian teaching at a Catholic university or a seminary. You come here, to this very forum and make statements like many we can find in this thread, flatly disagreeing with what the Church is now teaching on gun control.
You get called into a meeting with the bishop overseeing your teaching facility. And he points out some mistakes from the document you provided above. ‘You didn’t come to me with your disagreement first…’ (21-24, cites Church constitution, and 30). ‘We disagree over wether this is doctrinal, but even if it were not you never should have presented your position as a non arguable conclusion…’ (27, which is under the expressly invoked Canon Law principle of unitas caritatis). ‘You even claimed you were not bound to the teaching because it was not dogmatic/infallible, this is the most radical form of dissent…’ (33-34, which gives this exact example in almost these exact words and cites Church constitution; it also falls under the Oath of Fidelity, not common for the laity, but assumed (22) for our theologian)…
I know that last one is close to the topic I cannot debate here, but we are talking about a hypothetical theologian and his instructions from the document above. In any event, I could go on and on, but let’s just say that the bishop takes disciplinary action which includes limiting certain types of public speech on this topic (gun control) at least until all the steps outlining on how theologians are supposed to try to reach common understanding with the Magisterium outlined in the document above are exhausted.
Do you really believe that if our theologian appealed his situation in the court system of the Catholic Church that his bishop’s actions would all be wholly unfounded under Canon Law?
Part of the reason that people understand Canon Law so poorly is that the primary enforcement mechanism is the individual’s desire for something from, or simply participation in, the church. If our hypothetical theologian didn’t care about working for the Magisterium or access to Sacraments, the law would be unenforced, but it would still be the law.