it seems to me like the letter writer also has a need to know what's really going on with the sister so there's not a mistake about it her whole life. leading someone to being treated as insane when she's not would not be the burden i would want to bear. people are imprisoned for years for crimes they didn't commit due to faulty or flimsy evidence or juries being convinced of something in advance without real evidence. we've seen many times that with more technology, or more looking into a matter, if you will, innocent people were proved innocent, even after decades in prison. the difference between really getting evidence and not getting it is huge.
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