We're saying that the Book of Mormon is better than the Bible, so there!
We're saying that we should use the best available scholarship to find out what the earliest texts say and to understand their context so as to have as good a translation as possible
We're saying that we don't really care what the Bible says, because if we disagree with something in there, it probably was not translated correctly
We're saying that the Bible is functionally inerrant (aside from a few mistakes), since it has been translated correctly
We're saying that the only way to get a proper translation is through supernatural means, like the Book of Mormon, so the JST is the best translation
We're saying that stuff is bound to get lost in the great game of literary telephone even if the scribes had the best of intentions
We're saying that plain and precious things have been removed from the Bible by deliberate, nefarious choice