Although the state often justifies laws based on ethics, the role of the state is not to govern ethically but rather to act within the best interest of the state and its citizens.
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What one person considers ethical, another may consider unethical. Therefore, ethical considerations made by the state are often arbitrary.
What should be illegal is not always unethical, and contrariwise what is unethical is not always illegal. ... i.e. a parking ticket is illegal but not unethical, and lying is unethical but not illegal.