Norms form backgrounds.
Upon which foregrounds can play.
Norms change more slowly than foreground but they do change. And What you think is norm may be foreground, particularly if it is erratic in which case there may be a norm you’re not seeing being violated.
Multiple norms occur in a nearly simultaneous manner. But is a conflict between a variety of norms or between norms and foregrounds? It seems to be case by case.