Principles are maintained only by the imperative of social cohesion. Good ideas do not require force. Problems arise in the present society because people abdicate their conscience to the rules. People act is ways which are unreasonable because the rules are rigid creating scope to justify the unconscionable.
People would be at liberty to violate principles. Principles are sensible and practical guidelines, so only the ignorant or foolish would choose to violate them. There is no enforcement, but there may well be social consequences. If someone is concerned about potential consequences, then that’s a sign that their conscience is uncomfortable with their intended course of action.
People are at liberty to react in whatever manner they deem appropriate, and again there may be consequences. This creates the imperative to strive for social cohesion.