Since I assume he doesn't want to have existential risk increase, a credible threat is all that's necessary.
Perhaps you weren't aware, but Eliezer has stated that it's rational to not respond to threats of blackmail. See this comment.
(EDIT: I deleted the rest of this comment since it's redundant given what you've written elsewhere in this thread.)
Perhaps you weren't aware, but Eliezer has stated that it's rational to not respond to threats of blackmail.
I don't think he was talking about human beings there. Obviously you don't want a reputation for being susceptable to being successfully blackmailed, but IMHO, maximising expected utilily results in a strategy which is not as simple as never responding to blackmail threats.
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
July Part 1