About thirty-five years ago, Stephen Toulmin wrote an article on the topic: How medicine saved the life of ethics. I think it is still worth reading.
Toulmin argued roughly as follows:
During the first six decades of the 1900s, ethics wasn’t feeling well at all. One might say that it suffered from moral aphasia: it couldn’t talk sensibly about real ethical problems.
Read the rest of this discussion piece
Read Toulmin’s seminal article