I understand the points you raised, sadly it is a "twisted" application of the "golden rule", which is the summary of the 7 Laws of God that includes "YOU MUST NOT KILL". So killing self or others are definitely NOT INCLUDED in the correct application of the rule.
Eve's sharing the fruit is also NOT included, because BEFORE the golden rule, there is another HALF, which is MOSTLY overlooked nowadays, that is HAVING GOD to worship alone. Which coincidentally requires someone WHO APPLIES the second half(golden rule) to OBEY GOD. Eve having disobeyed God already by eating the fruit, is actually DOING harm to his neighbor. THUS IT IS NOT A CORRECT application of the rule whatsoever.
Disobedience to God is the "root of all evil," until an anti-Christ like Paul, twisted the matter.
:)
You know the answers, it is only hard to accept them, sometimes.
You're assuming sufficiently complete information datasets and rationality of decision making.