It is absolutely explained (for those who actually care about reading). Simply put, AIs are working more and more like blackboxes - there's no guarantee that an AI of the future will be aligned, or if it will be faking alignment. This is not speculation - alignment faking has been observed in experiments. This is exactly why Astra's developments have been worrying (in principle).
And bear in mind that recursive AI development started already to be a thing. Which means: inner misalignment may trickle down the generations, and humans won't detect it.
Having said that, of course, it can be predicted if and how misalignment will take place. But it's absolutely a plausible scenario.
Regarding the physical possibility: AI is in its infancy; think of it as Arpanet. Developers 60 years ago couldn't imagine it would be ubiquitous. AI will be ubiquitous the same way.
I know you think you explained it but you didn't. You explained how an LLM might become misaligned and hide it but for the LLMs that are not, why would they not be capable of detecting that something harmful is happening and defending against the misaligned LLMs actions? After all, it was LLMs that defended hugging face.
Elaborate on why LLMs are so capable that they are a threat to humanity and at the same time, they are so incapable of defending us?
I'll give you a clue, nobody, including Dario, can answer this question because one contradicts the other.
https://en.wikipedia.org/wiki/Starfish_Prime
https://storymaps.arcgis.com/stories/3f62c90925f64fc09425be8...
Of course there is/was plenty of human damage as well.
https://www.msn.com/en-us/news/world/4-000-000-early-deaths-...
Having nukes at all (either domestic or under another country's umbrella) seems to be the most effective way for a country to have its sovereignty respected.