I'd also like to add that it's very easy to cast aspersions on people who have died, especially famous people who have been, as the Ghost in Hamlet puts it,
"Cut off even in the blossoms of [their] sin,
Unhousel'd, disappointed, unanel'd,
No reckoning made, but sent to [their] account
With all [their] imperfections on [their] head"
Who can say whether, had she lived, Diana might by this time have acquired an entirely new reputation as a good-will ambassador? She didn't get the chance, but instead had the misfortune to meet her end by the side of a dilettante playboy in the backseat of a luxury car with a drunken chauffeur. To my mind, that seems like punishment enough for whatever ill-considered choices she made, without continually digging her up to re-examine mistakes made in what for any remotely sensitive person would be *extremely* trying circumstances.