It's pointless to make rational arguments about this. The other side is using arguments of faith, and will Gish Gallop past any logic.

At the very least, you run into the same logical fallacy that has underpinned all discussions of AI: over-extrapolation.

"Sure, it doesn't have intent or motivation TODAY, but at the current pace of improvement...."

But the current top-rated comment is already asserting that motivation is not required, because microorganisms also exist and do things and (presumably) do not have intent. So you can see that the well of logical fallacies behind this particular apocalyptic belief system is quite deep.