To be fair, they didn't say it was gonna be smart, they said it was gonna kill us. You don't need to be smart to kill someone.

I've seen a lot of theory that machine learning will kill us all not by being perfect but by us importing our own stupidty. Some algorithm is going to find the optimal solution is "let the nukes fly" when we're trying to find a recipe to improve mouthfeel of non-meat burgers.