Kabbalists say: the bible is code. They, of course, mean: the Old Testament, the 5 books of Moses.
If the Bible is code, then it is not a story... or if there is a story there, it is itself code: meaning an illustration of a principle.
Egypt stands for slavery. Slavery to whatever people are a slave to: riches, significance, sex, entertainment, desire to receive for the self alone, their racket, the racket with which they extort goodies from others, justify their nastiness, their domination, their haplessness.
Nature or nurture is a big question, even though, in the big picture, it won't matter.
What is part of nature can be changed. In fact it is being changed effectively all the time.
What is part of nurture is harder to change, but it's possible. It just takes more work.
Just the opposite of what you thought, right?
I am a good example for nature being changed: I got smarter than when I started, smarter than my siblings and my parents... through application. High achievers in the world are mostly of this type: born with little or average, worked harder, accomplished more than what they would get if they didn't grow what they earned.