Whatever your own opinion, Google did it out of what they perceived to be good intentions (and very likely business sense given a global audience for their products). Yet their intentions directly lead to unintended consequences. Google is being a baby with a gun in essence. Like he says, what if they decide to ask it to solve climate change and it decides to wipe humans out?
Obviously it's still very theoretical and can't do anything like that, but the point is more that perhaps Google doesn't have the culture necessarily to truly interrogate their actions.