You are talking through your hat, as they say.
There is no such thing as 'corporate sin'.  Sin can only be attributed to individuals and only individuals will be held to account at the Last Judgement.
These Cardinals have simply asked the Pope a question, how can that be a sin or a corporate sin? Is asking a question now a sin?
Plucking unrelated quotes from Aquinas which are not relevant to the current situation smacks of desperation on your part. The Primacy of conscience is not a simplistic doctrine as you would realise if you studied it in depth rather than superficially. Culling quotes from Aquinas suggests that you really haven't a clue what he is talking about in depth.
If one does not think with the teaching of the Church, with the Magisterium that leaves one to be 'de facto' outside the Church of Christ. One can keep up the pretence if one likes and wallow in self-deception but one cannot deceive God in the long run; God will not be mocked.