However people were created they had to be created that way, because that is the way they were, in fact created. To deny this is to deny your own existance.
Consider this, your ancestors chose to stay in Africa, or they chose to walk North, or South, or East or West. What made them choose what to do? It does not matter how they came to the conclusion. What matters is the conclusion that they would inevitibly make. The conclusion that they made (which direction to walk) was never really a choice once you take in to consideration all of the facts. For once the brain acquired all of these facts, the decision was inevitable.
Two identical brains could not have the same set of facts and draw a different conclusion. The conclusion is already drawn in the brain, depending on how the identical brains are hardwired. Think of two identical computers. When given a problem they too will inevitibly draw the same conclusion. This is why we can count on calculators. People also work in the same way. A brain is hardwired just like a computer. The only real difference between a brain and a computer is creativity, and the plasticity of the brain, which allows for adaption. However a brain will not change its neural connections unless it has reason to change. And it would only have reason to change if it has come to a conclusion that it is necessary. Whether a brain would determine that it is necessary to change, or that it is not necessary to change is predetermined, and there is really no choice at all.
You can not distinguish between nature and nurture. There is no debate. Our nature chose our environment through a predetermined choice. Our nurture is a direct result of our nature, not an influence.