Why aren't people naturally and spontaneously wholly-Good?

It seems evident to me that nobody is naturally and spontaneously Good - that is, nobody lives wholly in harmony with God's creation and intentions. Indeed, we don't, any of us, get anywhere near this ideal! (i.e. We are all "sinners", as Jesus said.)

Why should this be? Why is it that - as created Beings dwelling in a wholly-Good-God's creation - we are not wholly-Good? 

My answer is that we ourselves are not wholly created Beings; but are instead eternal Beings who existed from before divine creation; and therefore we are now a mixture of God's creation and our primordial selves. 

Our primordial selves are what make us genuinely free Beings, and also what means that we are not wholly aligned with divine creation.

That we are "mixed" entails that some of what makes us is a "product" of divine creation, and some of what makes us is not.   

Thus we find-ourselves. We know from experience what it is to be in harmony with God's creative will; and we also know otherwise. 

At one level; this finite mortal life is therefore a time of choice; when that which is free in us needs to make a choice whether to affiliate with God's creation... Or not. 

We are what we are; and in terms of God's purpose for our mortal lives, this means that we not meant to be naturally and spontaneously wholly-Good - but to make this choice...

Do we want to commit fully and eternally to live in harmony with God's creation - in which case we choose to follow Jesus Christ to Heaven (that being the method by which such a goal is attained)? 

Or, do we want to disengage from creation; and return to something like the primordial state of isolation, non-communication with other Beings, a state of barely-conscious "beingness"?  

Or, do we choose to oppose God and divine creation... Perhaps because we resent having being co-opted into this scheme in the first place; or because we dislike our presumed role and situation in the scheme of creations, or because the price of choosing Heaven is too great (i.e. we do not want to live forever wholly by love) ... Or for any reason.

That is the choice of this mortal life; and there are no other options.