If you saw someone who was going to jump off a cliff… would you stop them? Assume that you would prevent them from physical death. I think you would probably try to stop them.
Now assume you are an Archbishop, and you know of Catholics who are advocating very publicly for grave sin, and that this itself is a grave sin. Unrepented grave sin, as you know as an Archbishop, brings spiritual death. You know in your heart that spiritual death is eternal, and is God’s most hated thing. You also know that this spiritual death is very real, and very dangerous: infinitely more dangerous than mere physical death. Would you not, as an Archbishop, care enough about your fellow Brother or Sister in Christ to do everything in your power to prevent further spiritual death?
And you would also know, as an Archbishop, that someone who is manifestly and publicly in a state of grave sin ought to refrain from receiving Communion, for their own sake, since receiving Communion unworthily is yet another grave sin that further wounds their soul.
And it would probably strike you, as an Archbishop, that this particular sin is a sin with a pedagogical dimension (public advocacy of sin teaches sin). Would your counsel to this person not also have a public dimension, to correct those who may have been misinformed by this person’s very public advocacy (perhaps even encouragement) of sin?
Would you not see three very important things which demand your prophetic teaching voice? Is not the most pastoral thing to do preventing such a person from further grave sin? Can your message not be delivered in a spirit of charity and sincere concern and love?