It's space magic because the three laws are like... The complete basis that the robots AI is built on, to the point where it's not even possible in some of his worlds to make a stable AI without them (there's stories were people try even minor changes to the laws, and it causes big mental issues). The laws are like, a magical law of the Asimov universe that you can't have a stable AI without making these three laws a 1000% integral part of them that's totally impossible to change without causing massive destabilization.
Edit: Damit, I wrote this reply before you deleted the second part of your post, and I thought the first part of your post was directed towards Sirus, so I also deleted my reply to that.
I think there's a lot of points to Asimov's stories. But in many of them no, the point is that when you fuck with the laws it causes issues (because they are a space magic integral part to how the universe works). the laws themselves often work freaky well. (Once again presumably because of spess magiks)
I'm reminded of several of his stories where fucked up shit happens but the robots still work perfectly fine (like one where a bunch of robotswho's fauliure to do their job would destroy the world stop believing that the world actually exists but they still function perfectly fine because lol religion I guess?)
That at least is sorta the overarching moral I got from his stories. Sure, there might be some bad things, but damn robots are fucking sweet.