Still not convinced you can teach ethics

Teaching ethics is hard and as the WSJ reports, colleges are not having an easy time of it.
CollegeJournal | MBA Track: "Three years after coming under attack for their M.B.A. graduates' involvement in the many corporate scandals, schools are still grappling with how to teach ethics more effectively."

How can you teach ethics? My best advice is to attempt to show why it really is in your best