According to Genesis, "Of the tree of the knowledge of good and evil, thou shalt not eat of it." What's wrong with knowing right from wrong? When all that you know is that which is right then knowing what is wrong has to be attained by experience. So experience of that which is evil. And that is what is wrong. There desire to experience evil which they never felt or done in their lives. As one who never had a drug addiction before but then tries drugs for the first time. And wishes he never tried it because now he or she can't stop. Or any addiction, there are some experiences in our lives that we wish we never done before that was better not knowing how it felt then now being addicted to in some sense or experiencing pain because of it. Not all knowledge is good especially if you have to go through trouble to attain it and find out it wasn't all that you imagined it would be. The saying it can't hurt to try in many occasions it has and it cause pain on yourself and others you loved. Say that you have a child who has an innocent mindset why do you want to expose that child to r-rated movies or filth. Adam and Eve was like newborn babies even though they came to be already grown up their minds were innocent. And it was in no condition to be exposed to things that wasn't meant for them to be exposed to. There some experiences I wish as a child I never gone through like rape by a family member. Now we all might say knowing about sex is good but not in all occasion especially when you are a child. When you have a mind set that should not be on sex before it's time. Or in the example of drugs there are some drugs we desire not to be exposed to because we rather not have that experience because it would save of from addiction or sorrow by the hurt it would cause our family. So knowing right from wrong in their case was wrong.