Best I’m saying: a careful study in this instance being mine and to include a careful study by anyone can see the similarities to a Jim Jones mentality. Read the Humanist Manifesto for yourself. The followers are pre-occupied with self destruction fueled by desperation and paranoia.
Religion and religious people appear as a boogie man behind every shadow.
The terminology of the three manifestos are obviously designed to just skirt around the norms of society luring the unsuspecting candidate into a prison of mind control.
Once an idea that society on the outside of this cult is seen as an uninformed hoard, society becomes the enemy that cannot be conquered and in protest, the mentality creeps in that the logical thing to do is remove themselves from the dilemma by suicide.
Humanism has been around for a long time waiting for the accident to happen. The reward for them , crazy as it may seem is: society must bear the guilt by being left around to tell how it happened.