That's how movies work as we know. We can relate to the emotions and people in the story. So, because experiences are necessary, then opposition is necessary or else we won't know between good and evil. And if we don't know between good and evil, we'll never understand what will make us happy or sad or if anything is worth learning or progressing for. And if we don't understand, we can't be edified by the Spirit who testifies of truth. And if we're not edified by truth, then we cannot feel of God's love which is manifest to us through the Spirit. And if we don't feel of His love, grace and mercy, we won't have the motivation to live for anything that will bring lasting peace, joy, and happiness.
Our job as members is to help people relate their life stories to those in the Book of Mormon and Bible so that they can begin tounderstand what they mean and how they apply and be nourished by the good word of God. And when they understand, they'll feel the Spirit, and in essence God's love, ''which is the it is the most desirable above all things.'' (1 Nephi )