Well in the case of Under the Green Moon, there aren't any capital-letter Good and Evil breeds, nor are there any Good or Evil cultures. There's plenty of room though for individuals and polities to do good or evil, and justify it as they will.

As for variable intelligence, I confess I'm ducking the idea, in part because the idea is so ephemeral. I just consider it such a hot-button issue that I decided even if there had been any breeds with different intelligence, that they weren't successful and are no longer around. After all, even a servant race in a high-tech culture needs to be intelligent.