At this point, I think something has to be done to handle parties who come into nations with established cutural protocols and history, and completely ignore it.
It happens repeatedly (especially from . . . shall we say, certain sides who feel they don't have to follow the rules. . .) and then old line parties who have worked to preserve the RP history of nations have to RP the damage away (which the newcomers then ignore).
There has to be some enforcement of the cultural protocols and history.