I had never quite walked through it like that before. After the fall they lost free will. This implies that man will always choose darkness if left on his own. This seems to make sense to me. Decisions are made by weighing options.
People make decisions based on available facts.
I'm thinking that the choices we do make are determined by many things. Conversely, if at lunch time your friend cancelled, you were not all that hungry, you still had more work to do, you could take lunch later etc. Different factors present different choices. This is exactly why God influences us to do good, because without an influence there is no reaction. It is for this very reason that thee is evil.