Yes, love is the key difference, understood as consciousness of God's love, and as moral conscience, understood as God's golden rule.
Now, what about the other question: Understanding that the history of the Bible is comparable to making sausage, why do you think most of the Scriptures were written?
There is no single reason because no single human set out to write the "Bible" and there are enough inconsistencies to rule out God dictating it through various flawed human agents. If you want to discuss a large part of the OT, I would recommend, "Why the Bible began" by Jacob Wright. He provides a logical basis for the histories. The Psalms were part of ancient Israel's worship. The wisdom literature was preserved because it was wisdom, note that some Psalms and some wisdom literature show strong connections to neighboring cultures, sometimes almost perfectly word for word. The prophets were records from actual people who were perceived as receiving messages from God. For the NT, Matthew, Mark and John were written to tell various groups about the life and person of Jesus, following certain established literary patterns, sometimes inventing "proof" of prophesy fulfillment as was considered acceptable at the time (there were many "prophesies" about the coming messiah, not all of which Jesus fulfilled). Luke-Acts was written in an attempt to ensure that the Romans would cease to see the Christians as a problem, again following a set literary pattern. Paul's letters, including the Pastorals were just that those of his letters that were not too dangerous to preserve (some have clearly been lost). Hebrews is a preserved sermon most likely. James, Jude and 1, 2 Peter were written as guidance. 1 John was a cover letter for the revised version of John that we know today, 2 and 3 John were preserved as authentic letters. Revelation was a record of a vision that was had by a recognized prophet of the NT period.