LLMs can't even figure out how to do basic things. They can't program well despite billions being poured into that effort. I'm not worried they will suddenly develop intelligence out of nowhere and kill us all.
The self driving vehicles could target food delivery -- not your ubereats, but farm trucks and roads. Destruction of logistic infrastructure results in mass starvation. Individual targets for a complete eradication would take more effort, but a significant cull of the global population seems quite feasible with today's tech.
But folks are also doing virus research with AI. If such a lab gets hacked to make a super-virus, and its containment gets breached by a kinetic impactor, it could be cataclysmic.
But I hope you're right! It's not like the world's armies have enough nukes to eradicate all data centers or anything.
See, I, too, can write meaningless prose.