EDIT: I now believe the below contains substantial errors, after reading this message from the attacker.
Maybe you want to do sleuthing on your own, if so don’t read below. (It uses LessWrong’s spoiler feature.)
I believe the adversary was a person outside of the EA and rationality communities. They had not planned this, and they did not think very hard about who they sent the messages to (and didn’t realise Habryka and Raemon were admins). Rather, they saw a spur-of-the-moment opportunity to attack this system after seeing a Facebook post by Chris Leong (which solicited reasons for and against pressing the button). I believe this because they commented on that Chris Leong posted and say they sent the message.
EDIT: I now believe the below contains substantial errors, after reading this message from the attacker.
Maybe you want to do sleuthing on your own, if so don’t read below. (It uses LessWrong’s spoiler feature.)
I believe the adversary was a person outside of the EA and rationality communities. They had not planned this, and they did not think very hard about who they sent the messages to (and didn’t realise Habryka and Raemon were admins). Rather, they saw a spur-of-the-moment opportunity to attack this system after seeing a Facebook post by Chris Leong (which solicited reasons for and against pressing the button). I believe this because they commented on that Chris Leong posted and say they sent the message.