“How do you teach table manners?”
What does taking courteous manners seriously look like? How children taken seriously learn table manners.
etiquette
“Surely it is not coercive to have a rule that whenever our child goes out, he must first tell us where he is going and for how long? What about being a responsible parent?!”
If, to you, being a responsible parent requires coercing your children, unfortunately I think that very conviction may itself cause some of the very catastrophes you hope to avoid. Children no more react well to being coercively controlled than we do. Coercion has unintended consequences that most parents do not take into account.