...followed some misguided optimization function to drive humanity out of existence.

There's a thought experiment from years ago that went through a scenario, where a dumb-AI was told to corner the market on flowers or wheat or something innocuous, and the logical progression of what it felt it needed to control and takeover lead to the end of humanity. Google is clogged with AI now so I can't find it.

I agree with your sentiment, were worried about intelligent nuclear bombs, when a misplaced dumb one will do the same job. At least a smart bomb you can face and fight, an accidental detonation one you can't.

"The real troubles in your life
Are apt to be things that never crossed your worried mind
The kind that blindsides you at 4 p.m. on some idle Tuesday"

Remember to wear your sunscreen.