Adam did not take the leadership responsibility that was his.
Who knows what might have happened if he had corrected Eve's disobedience on the spot?
However, they both ate, and we have our first example of redirection.
Adam pointed his finger at Eve and said, "The woman you gave me...", and Eve tried to blame it on the serpent. Mankind has been trying to avoid individual accountability ever since.
As for the Judeo-Christian tradition being the only one that portrays the "serpent" as evil, and all other belief systems venerating the "wise, old snake", I do believe that is worthy of note. Especially from the perspective of Christianity being Truth.
If you were exposed as being a scheming, underhanded father of lies and evil, wouldn't you want to do some PR to counter that? That's what satan has done in all those other religions.