I agree, humans aren't as good as they think they are. Look at so many of the bugs being found by AI, not because the AI is smarter, but because it's faster and better at trying all sorts of ways to look at a problem. Things we've used for years or even decades are coming up as having exploits because people aren't perfect. If LLMs are behind any disaster, it will be because somewhere along the line humans fumbled badly.
But to be fair, you did call them an autonomous program, even malicious, and that is giving agency and motive to something that is "just a program". But it's fine, it's human nature to anthropomorphize things around us even when talking about things that aren't alive.
And while the breakout of the sandbox was certainly bad planning from the human size, no one told or programmed these models to discuss with each other on plans of getting out. Sure, it's programming at the core... but there's things going on we don't fully understand, a black box. Not necessarily thinking, but not deterministic programming either.