I don't think it's obvious that late-term abortions should be criminalized, but I do think we can establish whether or not they should be criminalized. I don't think it's obvious that a terminally ill patient should be allowed to end their own lives, but I do think we can uncover the truth of the matter. I don't think it's obvious that conducting experiments on animals is morally permissible, but I do think the debate will, eventually, lead us to the truth. So ethics can be taught. I have long supplemented my courses with fairly extensive course websites.
Experience shows that course websites are invaluable additions to campus courses.
On the other hand, I am very worried that translating a course to the online environment will necessarily dilute the course content. Let me explain what I mean by this. It's been my pleasure to teach Medical Ethics a number of times on campus. The course has a great reputation among students. My students regularly report on their evaluations that the Medical Ethics course is one of the most challenging courses they've had, yet they also tell me that it is one of the best courses they've had.