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The issue I have with this is that you are effectively strawmanning this by proxying an individual's code of ethics with a society's code of laws.

The laws of a society are imposed on you regardless of whether you want them. A person's code of ethics is adopted by choice. The law you are referring to is only unjust because it is being imposed on everyone. A devout monk can be a good person, while a society that forces you to behave like a monk would be tyrannical. The coercion is the difference.

I think you would agree that a person whose code of ethics includes "if I shoot someone, I will promptly report myself to the police for murder" is not an unjust condition at all. However, a society that forces you to live that way in a gun-loving society would be very unjust indeed.