They just don't always get to vote. Consistently violate either side of this equation and you've got trouble. Law of Modeling. If you don't want your teen doing something, make sure you are not doing it yourself. Law of Punishment.
Punishment often springs from anger.
Punishment breeds resentment and a desire for revenge. Teens have many creative ways to retaliate. Law of Consequences. Consequences teach teens about the real world. In general, consequences need to be reasonable, respectful, swift and strong enough to get the teens' attention.