“Can I publish somebody else’s old journal/diary?”

Can I publish somebody else’s old journal/diary?
Can I publish somebody else’s old journal/diary?
“I’ve written a book that contains lots of stories about people I’ve know. A friend told me to set up an LLC and then can’t get sued. Is this true?”
I received an email from a woman who claims to have written a book about her channeled conversations with deceased celebrities. Whether you believe in channeling (a two-way conversation between the living and the dead) or not is irrelevant…
“I would want 20-30 copies for personal use and distribution but I do not want to make it available for sale to the general public. I use real examples from my career and real names…”
If the court finds that the offending statement constitutes opinion, it is not actionable.
“While healthy competition isn’t a bad thing, what happened next was awful. The owner of the website started posting negative reviews about my service online. She has never used my service. As far as I know, she and I are the only ones offering this service. She posts under different names but the claims made and the writing style show it’s the same person…”
If I write a letter stating these people consent to my representing them in my novel, would this suffice?
My friend said, “If you write about me, I’ll sue you.” But, I’ve already published the book!
Some authors are tempted to write what they want, and to hell with anyone who doesn’t like it.
I want to write about my childhood experiences and I’d really like to use names. What advice can you give?