Canon 212 is important:
"Christ's faithful have the right, and, indeed, sometimes the duty, according to their knowledge, competence, and dignity, to manifest to Sacred Shepherds their judgement about those things which pertain to the good of the Church".
This is one of the chief roles of members of the Sacred College of Cardinal with regards to the Pope. It is often the onerous duty of bishops, presbyters and deacons and the lay faithful too. For priests it is one of the images of Lumen Gentium, them gathering as co-workers with the bishop, not in the sense of a bishop lording it over his priests but working with them, for deacons there are all those patristic texts about being the bishops eyes and ears. What we are not supposed to do is be silent. A silent Church is either dead or fearful.
The good Fr Hunwicke has an important post about an important issue here. I too have heard about pressure being put on individuals to shut up and stop asking embarrassing questions. This kind of bullying is not good for Christ's Church. Telling people to hold their tongues, whether it is about the debate Cardinal Sarah tried to start (in fact started by Joseph Ratzinger) about the orientation of worship, or that letter of 13 Cardinals to the Pope during the Synod, or the book Remaining in the Truth by 10 Cardinals which Cardinal Baldissieri intercepted rather allowing it reach Synod participants or the 500 priests supporting the Church's traditional view on marriage, or the issue Fr John raises, now about intimidation of the 45 theologians and pastors who wrote the letter to Cardinals and Patriarchs asking for clarification of certain aspects of the otherwise beautiful Amoris Laetitia.
Intimidation can work on several levels from the Mafia boss who sends messages saying, "I know where you live", to someone threatening to deprive someone of their living or home, all too easy in the Church. It is especially worrying when the downright heretical are give free range and those who defend what has always, and everywhere and at all times been held as being the Catholic faith are treated with violence. This is not mercy, this is violence in action, so very much at odds with the doctrine of our Holy Father.