A well-known phrase attributed to Joseph Smith but more likely written by W.W. Phelps is this: "By proving contrarieties truth frequently appears." http://centerplace.org/history/ts/v3n21.htm
In the next sentence, Phelps wrote an insightful application: "So with the religion of Jesus, its beauties and glories often shine, when its revilers are endeavoring to expose what they may denominate, its deformities."
In this sense, discussion, debate, analysis, and even argument can be productive, so long as the discourse is friendly, collaborative, cooperative, etc.
Let's all keep that in mind when we discuss Book of Mormon topics (or any topic).