So why is God punishing the sinner when he is only acting out his nature?
SD
I'll answer your question, but I expect an answer to mine in return.
God is punishing the Unbeliever because they have transgressed God's laws. It doesn't matter that they may have been hard-wired to break God's laws. Sin, and by extension sinners, cannot be in the presence of a Holy God....no matter what the reason is for their sin.
In my analogy, did the Governor owe the two death-row inmates anything? Was the Governor unjust in only pardoning one inmate?