I respect your perspective and I hope I can clarify. Some of this is semantics (the way we use the words rather than what the words mean).
If you are interacting with a person you are communicating with them by virtue of how you move, what you say, and also what you don't say.
If a person is reaching out to another human being and sharing their experience, listen to them. It also stands to reason that a person is sharing those thoughts and experiences because they want some kind of communication back - verbal, physical, something.
No matter what you do, you are persuading and therefore manipulating that person. If you say nothing, or if you simply congratulate them, simply by virtue of that you are no more respecting that person's right to choose than you are if share your own reflections and views.
The important factor is to act with empathy and compassion, and genuinely listen. I support a person's right to both life and death - but out of love for my fellow human being I want them to be able to make an informed decision - not just by virtue of reflecting their own point of view back to them as though I were a wall, but by providing real world science, medicine, therapy, as options - challenging their perception that the world as they see it is reality - it isn't for any of us. A person's subjective experience of the world will always benefit from compassionate exchange with other human beings.