Jess Christensen (an area seventy) gets it right:

“Lucifer was also in the beginning. He “sought to destroy the agency of man, … [and being] the father of all lies” (Moses 4:3–4) entered the garden to deceive our first parents. He first talked with Adam, but Adam did not yield. Lucifer then tried “also to beguile Eve” (Moses 4:6). He questioned her: “Yea, hath God said—Ye shall not eat of every tree of the garden?” (Moses 4:7). Challenging one’s recollection of a past event can often create doubt. But Eve stood firm. Lucifer’s first stratagem failed.”
“Ye shall not surely die,” protested Lucifer, directly contradicting the word of the Lord (Moses 4:10; see also D&C 29:41–42). “For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil” (Moses 4:11). Lucifer spoke a partial truth mixed with a falsehood. If Eve were to partake of the fruit, her eyes would indeed be opened “as gods” and she would begin to know good and evil; yet the notion that eating the fruit could immediately make Eve as the gods was a clever deception. The purpose of life can be fulfilled only when we have time to prepare to meet God and learn good and evil by our own experience (see Alma 12:22–26; D&C 29:39).
At Lucifer’s suggestion, Eve began to notice that the forbidden fruit was good for food, or delicious, and pleasant to the eyes. Lucifer “knows well how to catch the eye and arouse the desire of the customer.” 4 Eve then chose to partake of the forbidden fruit. She subsequently encouraged Adam to partake (see Moses 4:12). Adam concluded that God’s command to remain with his wife (see Moses 4:18) was more important than His command to abstain from the fruit. Thus in the face of this enticement, “Adam fell that men might be” (2 Ne. 2:25).

Jess L. Christensen, “The Choice That Began Mortality,” Ensign, Jan 2002, 36

When the story is told properly, in sequence, then the inuendo of a courageous or wise choice goes away, or at least is placed where it belongs, in hindsight.

Interesting tidbit. The first six days of the creation all begin and end. However, the seventh does not–at least not in the scriptures. The seventh day does not end in Genesis, Moses, nor in Abraham. What does this tell us? If resting was all that God did on the seventh day, why didn’t it then say, “and the evening and the morning were the seventh day”, as it did the other six days?

So it seems to me that we can safely say that there are things that are considered sins and transgressions (and many of these may be social rather than religious), but that covenants make it possible to shift activities from being a transgression to being a sin. So, if we covenant not to speed, but we speed, it becomes a sin for us because we have broken our covenant not to speed.

“The reason the fruit was forbidden was a matter of individual responsibility. If God would have commanded Adam and Eve to partake of the fruit, then God would have been responsible for their fall and therefore would not have been in a position to save His posterity. The Fall must come by man’s agency rather than God imposing fallen conditions upon his children. When Adam and Eve chose to eat the fruit by their own volition, God was free to implement a plan that would help them overcome the consequences of the Fall.”

and

“Difference Between Adam’s Fall and Individual Sins
Adam was taught that the atonement would be made effective for each person through the exercise of faith, repentance, and reception of the Holy Ghost (Moses 5:8; 6:51-52). Adam was confused. The only way to initiate mortality was by eating the forbidden fruit. Why must there be an atonement made for something that he was supposed to do? So he asked, “Why is it that men must repent and be baptized in water? (Moses 6:53)
Atonement for Adam’s Fall
In response the Lord first said: “Behold I have forgiven thee thy transgression in the Garden of Eden” (Moses 6:51–53). Adam and Eve had acted appropriately in the garden by eating the fruit thus opening the way for God’s children to come to mortality. However, eating the fruit brought upon Adam, Eve, and all mankind, mortal and eternal consequences. An atonement must be made in order to free man from these consequences. “

They seem plausible to me, but no other authority I’ve heard or read seems to say these things. Are they all dense, or is he just mistaken?