[gilgoomesh]

I'm pretty certain the story of the tree of knowledge of good and evil and the expulsion from paradise is a parable about choosing between:

a) Happy but ignorant

b) Unhappy but well informed

and the fact that humans instinctively choose the second option. It's not a warning that knowledge is bad, it's just an acknowledgment that it's better to know the truth, even when the knowledge makes us feel worse.