I see some of what you are trying to say, but I don't think it answers my question.
Consider the following two cases:
(1) I say that God will only spare you from hell if you hop up and down on one leg and hum "The Star Spangled Banner". I am a lunatic.
(2) I say that God will only spare you from hell if you hop up and down on one leg and hum "The Star Spangled Banner". God himself told me so. I am a prophet appointed by God.
Now, how do you tell the difference between case (1) and case (2)?
You can't read God's mind, so the only criterion you can apply is whether
you think I'm a prophet of God or a looney.
Now, if case (2) was in fact correct, and God had appointed me to give a warning, then nonetheless people would think I was a looney rather than a prophet.
Could we blame them?
Edited by Dr Adequate, : No reason given.