But the thing to keep in mind is that this emergent thing is not necessarily conscious or intentional, but if it reaches the point where it self-replicates then it becomes effectively a life form that starts to undergo Darwinian evolution and thus becomes very difficult to get rid of. The point is that all this is (potentially) just a straightforward consequence of the laws of physics, not some sci-fi super-villain going "Bwahahaha! Silly humans!" in the back of data center somewhere.