Hang on Charles did his interview and that was ok -doing a "bare bones interview" and airing all the dirty laundry -a year before. He was being a man and honest about his feelings -all ok.
When Diana did it -under duress and false promises / paperwork etc -she was deranged -how is that fair?
I don't think so. Charles knew he wanted a divorce and got his side in first with the JD interview. He tried to paint Diana as mad, deranged, unfit, etc whereas "poor charles" hadn't been allowed to marry the love of his love, Camilla and was deeply unhappy but making the best of it. Whereas Diana then couldn't accept separate lives and went off the rails.
Whether by book or interview -I think she had the right to reply. The fact the BBC might have lied -well we know they do and we pay our license fee for waste and they do waste our money, and don't look after OUR money as the poor plebs us -have to cough it up under threat of prison. etc