I somehow doubt that Cardinal Ottaviani would ever praise the NOM as he did in that purported letter. In fact, during the infamous episode when his microphone was turned off, the Cardinal had spent 15 minutes (over his allotted time) denouncing the Council's attempts to replace the Tridentine Mass.
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Then why didn't he denounce the letter as a hoax? I don't think Sean grasped this problem.
Imagine if someone made an account on here called "Sean Johnson2" and claimed to be the real Sean Johnson, and started putting up a bunch of stuff promoting modernism and attacking Catholic teaching and saying Pope Francis is the best thing that ever happened to the Church.
Suppose also that everyone here on CathInfo believed this was the real Sean Johnson, and even became deceived by his ideas, and said, "Sean is a smart guy; if he thinks Francis is a great pope and Marxism is the wave of the future, maybe he's right!" And lots of members starting going to the Novus Ordo.
Don't you think (the real) Sean would get on here within 15 nanoseconds of finding out about this, and publish one thread after another denouncing the imposter and repudiating his errors? Of course he would.
He wouldn't just say, "Oh, I never made any of those heretical statements that are attributed to me by that fake account, so this is really not my problem, why should I bother with it?" Or would he content himself with writing a private letter to some journalist in France saying that "Sean Johnson2" isn't the real Sean Johnson, and leave it at that?
That's basically what Sean is saying here. It is absurd.
Yes, it is odd that Cardinal Ottaviani retracted what it says in the Intervention, since it seems like he believed in it, but as I said above, I think a much more plausible explanation is that he was threatened with excommunication by Paul VI and caved to pressure. That explanation certainly fits all the facts.
And the fact that his secretary was a member of the Consilium supports this idea too, that maybe he wasn't as conservative as we would like to think.