I cannot access the post (thread) by your link. It seems that it got deleted already. Do you have a snapshot or could you tell us what was in that post that made you think that someone is actually looking for something bad?
It seems it has been trashcanned (I can still see it) and his other post (a duplicate) has been deleted.
Is this what you consider as evil?
No, but because someone has access to his account and is fairly up to date on Bitcoin happenings, so it is possible that someone could use his account to post opinions and then later citing the posts as sources in support of or against someone/something. Hal is after all a fairly well known figure in Bitcoin and people tend not to check sources or may not know that he has died.
Edit:
Theymos has locked the account:
https://bitcointalk.org/index.php?topic=1847311.msg18382142#msg18382142I kept his account unlocked because I thought his family members might want to look at his PMs or something, but this is looking like his account was almost certainly compromised. So I locked his account.
The person who controls his account gained access via email-password-reset, so his email is probably also compromised.