The knowledge of clans is not necessary for the enforcement of the rules. One who is not in a clan and would never in a million years want to be in a clan is hopeless for a bias against certain clans. Members can probably relax more because there is no hatred of any magnitude involved, given there would be a bias, or a feeling of a bias.

Also, you should never make assumptions about the knowledge of others, unless you seriously enjoy being proven wrong by others in the future.