Further dialogue, and I promise that this isn't becoming a habit:
Njal's Saga actually makes your point quite well, when we see that the very institution Njal sets up is turned against him. But this also supports my point: that law must rest on something other than itself, or it will dissolve into the sort of chaos we see near at the Thing. Law ceases to be law when it's not obeyed, and becomes self-defeating if it can't be.
Other than that, I can't think what to say.