You'd be surprised how bad these stories end.
Upon reading the edit historyedit history I think StackOverflow staff could try to reach out to this person.
I know, of course, SO has no legal obligation to look after its users, but I do think that it would be worthwhile pointing towards professional help in this specific case. It is not a legal obligation, but a moral one.
Douglas if you are reading this, please contact an experienced mod in chat, for instance, Oli. You can also ping me if wanted.