I have seen questions of all kinds on Stack Overflow, many have something to do with sofware development but never seen an ethics tag?! Kind of weird. Is this kind of question allowed of what to do with your customers, whether to show or not a page requesting user data?
There really isn't much in ethics that is strictly programming-related. There are plenty of ethical issues that affect programmers, but they tend to be more general and would apply to quite a few professions. Heck, look at the ACM code of ethics. Most of the points don't even mention computing, and the ones that do aren't specific to software development.
That, and as Shog9 points out, ethics tend to be subjective, and it's really easy to get an argument started.