Why are there no courses on professional ethics?

We have a great course on ethics here: https://www.proformative.com/courses/ethical-decision-making-models and more are on the way. We add many new courses every week and this topic and related courses is part of that process.

If your question is about CPE ethics courses, well, we're working on that. There are more stringent requirements for ethics CPE and they vary by state in some cases, so it's is more involved. That said, we are working on it and hope to bring on some CPE earning ethics courses before too long. Thanks for the question and thanks also for using the Proformative learning platform.

Depending on what you are looking for and for what reason, the Institute of Management Accountants overs a number of ethics classes as well, as it is a requirement to have these classes to maintain the Certified Management Accountant.
Also, many IMA chapters offer classes as part of their regular educational meetings.
I believe that local CPA groups (like CalCPA here in California) also offer these classes.