My post below only tells the differences between these two aspects, your argument is most universal and works with both 治世 and 亂世.
In the given scenario, the traffic rules are made in order to avoid damages. If following such a rule in a case causes bigger damages, it should not be followed or otherwise it will contradict itself. In fact, the established rule that other vihecles should make way for the ambulance is an implementation of this principle.
