The Purported Purpose of the Book of Mormon

Many believe members of the church believe the Book of Mormon's purported purpose is to put the Bible straight. It doesn't actually clarify any of the contended issues of the Bible with people like, for example, who wrote this and when was this written? Is this a first hand or a second hand account? That's the way it should be. The only point of having prophecies is they can be experienced as miraculous by the people seeing a prediction of the future. If God had a chance to work a miracle, that book could have been the solve. But it's just not mentioned.