It's so much simpler than that smiddy, it really is. Just look at some of the books they've printed about Jesus; Listening to the Great Teacher, The Greatest Man Who Ever Lived, Come Be My Follower.
What group other than a Christian one would print books with titles like those?
Indeed. What other group would. (rhetorical)
Consider one of the books you mention. The "Greatest Man" book. Examine chapter 39. It completely bastardizes the Biblical narrative and this book says THE OPPOSITE of what the Bible clearly says. The GM book turns the illustration completely around, and the reason the watchtower corporation does so is because they hope to conceal the true understanding of what EXACTLY Jesus was condemning when he made the illustration.
And when one understands the truth of Jesus' words, then one sees clearly that He was not only condemning the hypocrites in His day, but He was also condemning WATCHTOWER today, because watchtower hates the truth in the same manner that the religious leaders of Jesus' day hated him for speaking truth.
And the GB knows it. Hence, the reason for their concealment of the truth.