No other human activity poses this level of danger. I do heed the warnings, but this comes across as detached hyperbole. See: global warming, nuclear weapon development, wealth inequality, war, technology dependence, etc. Also, this has nothing to do with LLMs or computers. Like all things, this is about humans.
Open weights agents with hacking capacities can reproduce themselves into the systems they hack (non-open weights ones will have to hack their creators first). Not saying they will, but if they do, good luck finding the kill switch.
Once swarms of agents run unsupervised on unmonitored hacked hardware, who can tell what they will do? The Huggingface incident showed that such swarms behave without any safeguard. It was a real HAL moment.
A lot of things are possible then: ransomware campaign, taking over IoT devices, self driving cars, planes, ships, satellites, missile launchers. If nothing's out of reach, everything is possible.
Bring robots into the mix, and the possibilities are endless.
I'm not particularly frightened tbh, but we shouldn't discard the worst-case scenario, and the worst-case scenario doesn't look good.