alt Hacker NewsYeah, I guess I agree with your thoughts. But keep in mind, the person may not have intended to "share their fantasies of violence." The details of the writing was described as a diary. See:
https://news.ycombinator.com/item?id=49961057
https://www.techspot.com/news/114091-florida-woman-used-clau...
This thread seems to be a dupe of that story.
If I saw someone's diary for whatever reason and their most recent entry was about getting a gun and shooting someone they knew, I'd report it to the police too.
An arrest isn't a conviction but this kind of fantasizing in any manner is probable cause for an arrest and grounds for a trial.
Arguably there should be a reporting duty for these kinds of thing.
I wish more people making threats got this treatment.