I get the impression that different wardens have different interpretations of their job. Some are nothing more than warlock-hunters, out to enforce the seven Laws. Others take a more benevolent stance, acting almost like the local wizard version of a classic superhero. In other words, some are The Punisher, some are Spiderman.
I definitely think it'd be easier to figure some of this out if we had better understanding of the accords. I'd love to get some answers to questions like "Can a member of one faction kill a member of another faction without causing an inter-faction incident if no other aspects of the accords (rules of hospitality, dueling rules, etc.) were violated?" Cases like self-defense, defense of a mortal, etc. come to mind.