Both 1 and 2 involve faith. I fully admit that. I have said before I believe that's one of the main reasons we are on this earth, to have our faith tested. With proof, there is no room for faith.<quoted text>I can think of a few reasons.
1) We know it was written by Joseph Smith. There is no reason or evidence to suggest it came from any other source.
2) Scripture does not mean fact. There is no reason to assume anything the Bible says is true. To operate from the view that it is true means you start with your answer and rationalize your way from there. And that is not how we do history, science, or any other truth seeking endeavor.
How about this: for those that have faith in God, and believe the Bible to be the word of God, why can't there be other records from other groups of people that Jesus visited when He told us he was leaving to tend to other sheep?
And as for 1. That was the purpose of the witnesses of the Book of Mormon. If you read the testimonies of the people that wrote what they saw, they did so to say that they saw and handled the gold plates and witnessed the angel Moroni that brought it forth.
Again I realize faith is required because one could argue that these men were all in cahoots. Though it isn't plausible to me that these men would risk their lives to do all of this, lose everything they had and still die poor.
Some of them even got mad at Joseph at some point and turned away from him but never denounced the BOM and what they said they witnessed.