I think you should take another look at the 1st Adam. Remember that the 2nd Adam 'knew no sin, yet became sin that we might become the righteousness of God' (2 Cor 5:21)
I'm thinking that Adam was trying something similar to save Eve, whom he loved. The final fulfillment (Christ) being visible in the initial appearance (Adam).
Well we know that the command not to eat was given to Adam....and the freedom to eat all but. Eve on the other hand was deceived, and we know sin came thru Adam's direct disobediance to God's command.
I don't know why God didn't reveal what was Adam doing the whole time the conversation between Eve and Satan was occurring...but we know she simply 'turned' and gave it to Adam and he ate... without resistance apparently. So he likely was there as this conversation took place.
But I don't see any indication he attempted to save Eve in what's recorded.....it's a mystery I am anxious to ask the Lord about when I see Him. Why didn't Adam stop it? Why did he yield?