You never know what one experience or trial may change someone else. Example: if there is someone out there and they are thinking of harming their mate or God for bid kill their mate, maybe going thru all these conversations and or the trial will cause them not to do that and get help instead.
There's a movie quote: with every breath we take it changes our lives.
These conversations could change anyone. And that's just one benefit.
But ethically speaking, people are not to be used as means to an end. Using Roberta Laundrie for some unknown end is contrary to the ethical system we have developed related to persons and their ultimate value in the western world. "Persons" are ends in themselves.
JMO