Well, yes. If you are bad, you want what&#x27;s best for yourself. But if you know that the other guy is bad, then you know he wants what&#x27;s best for himself. So you set up the rules of the game to ensure that he can&#x27;t get what he wants without you also getting what you want.<p>See the prisoner&#x27;s dilemma. If both people are bad, they will have the worst outcome. If either of them thinks the other is bad, then they will also be bad in order to protect themselves. So the best outcome (you are bad, and they are good) is impossible, because they know you&#x27;re bad and will be bad themselves.<p>So two bad people have a good reason to write a law preventing them both from being bad, because that&#x27;s the best outcome they can get for themselves.