Yesterday's plane making a turnaround because of a Bluetooth speaker with the name "bomb" (media says "a 4 letter word") makes me think the Skynet-level destruction is a risk, because humans are already too chicken-shit to take responsibility for decisions. They'd rather feel safe by just following the procedure, however stupid it is. And in the the future the procudre might be "Do whatever the AI says".
My thought about the turnaround: https://news.ycombinator.com/item?id=48343390
Absolutely. The real danger is that people treat LLMs like actually intelligent entities and stop making decisions themselves. Not that the LLMs will be conscious and evil in the way Sci-fi portrays.