I dont know. I think I get uncomfortable when money gets involved. That's my knee-jerk reaction.
You could argue the widow finds it therpuetic and wants to honor someone very close to her and expose truth. Are Stone and United 93 doing the same thing? Maybe.
Is there a difference, like cerefusion is saying, between journalism (ie) memoirs/photojournalism) and a fictionalized drama which ultimately serves as entertainment? There is and that gets at some of my initial reaction. Then again a movie like Battle of Algiers is a fiction, also tragedy, in some sense and really moves me.