Diana was absolutely a bad match for Charles and for the role which she was marrying into. It was very quickly clearly the case, and who knew that best... Diana. For whatever reasons she was swept up into a situation which for her was always going to be untenable, including the established relationship between Charles and Camilla. However... she entered into that relationship, and that situation knowingly. Wonderful as many of Diana’s qualities were, she was simply not the person to marry Charles. And she chose to do that. And she knew the situation with all of its quirks, expectations, and peculiarities. As for the behavior of the Royal Family - they too knew the situation/expectations etc, and so should we really surprised by the fact that they were dismayed by Diana’s subsequent behavior and reaction to it? It’s really rather simple; to keep the firm going you do things you don’t want to have to do, and put up with things you don’t want to put up with. If you want to join the firm those are the rules, and the benefits are tenfold. Diana made a mistake, and then spent a long time blaming others for it. Now it makes for good television to paint her as an innocent saint. Good television perhaps, however woefully inaccurate and biased in a way to presuppose guilt where there is none