Well, the Zeroth Law could help out for things like "for your own good" and similar, I think. Depends on the interpretation, really. Still, surgical robots would "die" every time they failed an operation, because they allowed a human to come to harm. Could be problematic. And robot cops might have some issues, even running under the Zeroth Law. The Zeroth Law in general has the potential to lead to a robot apocalypse.