LLMs don't need to hide anywhere to be dangerous, though. The danger can come purely from them reaching sufficient power together with some other idiot sufficiently crazy to use them to cause destruction.
I mean, in another thread somewhere around here, someone built an entire OS with an AI. What's to stop anyone with a sufficient taste for power to eventually use AI to cause havoc with it?
I think the underlying assumption in your post, which I believe is false, is that people are united somehow against catastrophe. They're not. There are plenty of people who participate in society currently but who would be more than happy to eradicate us normal people under different circumstances. Society often seems stable but it's far more fragile than we think.
I'm simply saying if we want to shut LLMs down we can do so without high tech kill switch - just shut down the facilities. But if a private user has an open model that is powerful enough to wreak havoc and run privately, then the whole point is moot because they can work around the kill switch. This kill switch won't work against bad actors.