Great question re: proving and protecting chivalry being communal or individual activities. We didn't get a chance to unpack this last week, but go back and look at the ending. You know what Arthur's court does when Gawain confesses that he's committed a terrible sin that he'll never be able to atone for and from which he will never recover as a person or a knight? They laugh. And then they decide that it'd be great fun to wear a green garter around their necks as a remembrance of Gawain and chivalry. It's a bizarre moment, but I think it goes back to the issues you raise here. Could Gawain have been corrected, or at least better supported, by a different court? Could a good community (one not keen to laugh at the failures of others) have better helped to preserve and shape a more ethical chivalry?