If Adam and Eve didn't know right from wrong till after eating the forbidden fruit, how was it morally wrong to eat it?

Today’s Sunday question is all according to the Bible, Genisis 3. Per what is written in Genisis, the forbidden fruit came from a tree called the tree of the knowledge of good and evil. Eve could not have known that eating it was wrong, because she had been designed by God to have no sense of right and wrong. God told her not to eat of that particular tree’s fruit, but the serpent told to do so. Without any moral sense, she went with the most recent instruction. Eve told Adam to try some, so he had the same defense. How is it fair and morally correct to not only condemn the primordial pair in their innocence, but to condemn all mankind, even those who have not yet been born?