The making of a rule actually hold. Enforcement is where a stated principle either has teeth or is revealed not to.
Old French enforcier, en- (to put into) plus force, from Latin fortis (strong).
Its root is strength put into something that had none of its own: fortis names the force enforcement pours into a rule the moment the rule is tested. A principle with no such strength poured in was never really a rule, only a wish.