Ethics, yes.
Let's start with "slavery is wrong", shall we...?
And some of the sci-fi on the subject is actually quite good, I think. Off the top of my head, "The Two Faces of Tomorrow" comes to mind...
Finally, no, when a doctor AI recommends a prescription you shouldn't "be able to pick apart how it came to that conclusion". No more than you are able to when a flesh-and-blood doctor does the same. AI got a certificate saying it's a doctor...? That's all I need to know, thank you!
Proper AI, the kind ethics would apply to, is a person, with everything that entails, good and bad. The sooner we get around to that understanding, the better off everyone will be.