I answer you the same I did then. You have to ask what is the source of the conviciton?
1. God appeared in vision, as to Joseph Smith.
2. God sent a witness of the Holy Ghost. As with many of us.
3. God sent some mortal person to give you a personal message. Oral Roberts and his "give me money or God will kill me" sermon.
4. Some pre-determined event will mean that God is telling you something. The finding the $10 bill.
5. The source of the "revelation" could be Satan.
A person in conditions #3, #4, and #5 could be 100% convinced. But that would not be the same as #1 and #2.
Of course, for people who have a different idea the person who says they are right is going to seem arrogant. But it isn't arrogance if you really are right. And I am not going to say that I think I am wrong just to please any of you. We aren't talking about appetizer spread recipes. If I were to say, "I make the best Philadelphia cheese spread" that would be hubris. I could be wrong because that is a matter of opinion only. A person who doesn't like olives and green onions mixed in with Phily cheese wouldn't like mine.
But, while I have not had a vision, I can still put myself in the position of Joseph Smith when he quoted Paul. "I knew I had seen a vision, and I knew God knew I knew it. And I could not deny it." I have had a spiritual witness of the truthfulness of the Gospel. God knows I have, and I can't deny it. That's why I won't admit to you that maybe, just maybe, I could be wrong.
And as I told you then, the question is not the actual SOURCE of the "revelation", but rather whether or not the level of conviction in the particular individual that his or her revelation was from God has any correlation to whether or not they are actually correct, and it did come to God.
While it is not possible for us mere human beings to know exactly what does come from God, we can draw some justified conclusions based on what God "told" the individuals. You agreed that, without a doubt, there are times when human beings are absolutely convinced God told them something, and they are actually mistaken.
That is the point, Charity - all you have is your utter conviction, your certitude, that God told you something. This is what you're offering as evidence - your certitude God spoke to you.
Perhaps if you take a moment to consider all the human beings who have been completely convinced God spoke to THEM, too, and were obviously wrong, you'll understand why we consider it fatally flawed as far as serious evidence.
And once again, I'm not asking you to abandon your beliefs, but to remember that it's possible you're wrong, and that possibility to bestow some caution in using this, in particular, as serious evidence.