> draw a very straight line to catastrophe

What's the straight line? I foresee catastrophe of the social media kind, where even more folks get brain worms from consuming AI information, but I don't foresee a physical catastrophe. How AI goes from "hallucinates all the time" to "self-improving superhuman thinker" to "being able to destroy the world" involves a bunch of logical leaps that are not exactly sound. At a bare minimum, how does a hostile AI secure the data centers it needs to operate from physical attacks like bombings? How does it defend undersea cables from being cut?

The real short term catastrophe is probably going to be economic and not in the sense of AI taking everyone's jobs, but rather in the sense of an economic crash due to AI overinvestment.