They're talking past each other because "AI" has become a useless term. Musk's comments are about a potential (maybe conscious) artificial super intelligence and the risks that could come from that if we enable one somehow without understanding the preconditions. Zuckerberg is just talking about "AI" in the sense that machine learning can solve a valuable class of problems. The super intelligence risk could be seriou…
I'll add another set of concerns you see in these discussions.
People know that the current version of predatory Capitalism we've created so far would happily mass unemploy everyone (possibly all the white collar workers reading this much sooner then you think). This would leave no workers and no consumers with money outside of the ultrawealthy.
I agree. I don't trust the current version of capitalism to program these AI of the future. I think they will burn the house down in their greed.