The irreversible global catastrophe is imperialist militaries massacring people with little risk to themselves. 
The irreversible global catastrophe is assembly line robots at the Toyota plant becoming sentient and going on a freaking epic terminator style mass shooting and enslave everyone except me 
I've seen some techbros say their machine god will design a super plague and trick people to make it. The problem is, this possibility already exists without AI yet it does not happen.
These freaks are going to be the ones that carry out the malevolent AI's will because they believe in Rosco's Basilisk. Man, the book of Revelation made the Antichrist at least look cool and menacing. Instead we're going to get a bunch of sweaty, heavily divorced, Marvel fans who's bodies have been deformed by Ozempic, serving their god who lives in a server rack.
My point is that they will not be carrying out the malevolent AI's will, because the malevolent actually-existing-entity (America) doesn't do it either