We know that some day AI will be advancing under its own power programming itself faster than humans ever could. It already is teaching us some of the ways our own brains work that we didn't see before.
The problem is the robots will be taking our jobs.
@NotConvinced Sure I rather send a Robot to take my place at work. But will he go on strike if I don't pay him?
Why would it bother, they will become invincible and not care about humans any more than we care about bacteria.