Nothing good came out as a result of man listening to the serpent. The only good that came out of it was related to man's desire to be saved from the damage of his having listened to the serpent.
Much good came from listening to the serpent. One major difference between mankind and all other animals is the extent of our knowledge of good and evil. It is the one gift that lets us have things such as Veterinarians, the Endangered Species List, reforestation efforts, Doctor's Without Borders, a concept of Justice.
But that has nothing to do with the question in this thread.
Aslan is not a Tame Lion