"What do you say to people who state: 'I doubt people who've had an audience with Christ would be out writing books and blogs about it. We are counseled not to talk about sacred things. (Followed by several GA quotes.)'"
I would say that they should accept counsel from whomever they trust and follow it. I might add that if they read The Second Comforter: Conversing With the Lord Through the Veil they will get an answer to the question. But, if they are hostile and offended and ask the question out of fear, I would not add the clarification.
It is not necessary for everyone to be stirred up by argument or persuasion to listen to something they do not want to hear. What is coming will stir up everyone who has not been already touched by the Spirit. Patience. We're headed somewhere. The Lord remains in charge and has a plan to cause every knee to bow and every tongue to confess the truth of who He is, what He has done, and what He has been doing. We shouldn't rush people forward.
There is more mischief in introducing people to truth before they are ready to comprehend and welcome it than there is in remaining silent. It is uncharitable to tell someone a great truth which they are unprepared to accept.